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LK Mosfet Amplifiers

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					       LK
Mosfet Amplifiers

     LK 602
     LK 902
     LK 454

     LK 654


OWNER‘S     MANUAL
                                                                                                              Built-in Crossover
 FEATURES
                                                                                                              The IMPACT LK series amplifiers feature built-in electronic crossovers.
Two Channel Amplifiers LK 602 , LK 902
                                                                                                              The 2 Channel amplifiers feature a continuously variable low pass and high pass crossover.
                                                                                                                                                                                         s
                                                                                                              The 4 Channel amplifiers feature a pair of continuously variable low pas and high pass crossovers.
   Two Channel Bridgeable MOSFET Amplifier               High Pass Crossover (100Hz)
   Tri-Mode Capable                                      Nickel Plated RCA And Speaker Level Inputs           The IMPACT LK series amplifiers have been designed with 100% MOSFET power supplies, ensuring
   Heavy Duty Aluminum Alloy Heatsink                    Remote Turn On / Turn Off Circuit                    extremely quick switching response for plenty of clean power.
   Class A-B Operation                                   MOSFET Pulse Width Modulated Power Supply
   Continuously Variable Low Pass Crossover              2 Ohm Stable Stereo Operation With Output
   (35Hz to 155Hz)                                       Power Increase                                       Protection Circuitry
   18dB Bass Boost                                       Soft Turn-on Circuit                                 The amplifier protection circuitry will disable the amplifier if the inputs are overloaded, short-circuited or
   Remote Subwoofer Level Control                        Thermal and Speaker Short Protection Circuitry       extremely high temperature conditions are detected. When the protection mode is in operation, the LED indicator
   Continuously Variable Input Gain Control              LED Power And Protection Indicators                  on the front panel will be illuminated, indicating the amplifier has gone into a self-preservation mode.

                                                                                                              If you observe that the protection LED is lit, please check the system carefully to determine what has caused the
 Four Channel Amplifiers LK 454, LK 654                                                                       protection circuit to engage. The amplifier can be reset by turning the remote power off and then on again. If the
                                                                                                              amplifier shuts down due to a thermal overload condition, please allow it to cool down before powering up. If the
    Four Channel Bridgeable MOSFET Amplifier                 Continuously Variable Input Gain Control
                                                                                                              amplifier shuts down because of an input overload or short circuit, Be sure to repaire these conditions before
   Heavy Duty Aluminum Alloy Heatsink                        Nickel Plated RCA And Speaker Level Inputs       Attempting to power up the amplifier again.
   Class A-B Operation                                       Remote Turn On / Turn Off Circuit
   Continuously Variable Low Pass Crossover                  MOSFET Pulse Width Modulated Power Supply
                                                             2 Ohm Stable Stereo Operation With Output        2 Ohm Operation (in stereo mode)
   (35Hz to 155Hz)
   18dB Bass Boost                                           Power Increase                                   The IMPACT LK Series amplifier was designed to operate effectively at loads down 2 Ohms.This
   Remote Subwoofer Level Control                            Soft Turn-on Circuit                             means that you can install four 8 Ohm speakers per channel when using parallel wiring. Increasing
   High Pass Crossover (100Hz)                               Thermal and Speaker Short Protection Circuitry   the number of woofers per channel at low frequencies (up to 100Hz) produces an acoustic
                                                             LED Power And Protection Indicators              coupling effect. This acoustic coupling increases your power output by 3 dB per speaker.

                                                                                                              When operating at 2 Ohms, the amplifiers will increase their output power by approximately 50%. The
SPECIFICATIONS                                                                                                current draw will also increase by about the same amount, so be sure you have enough current to run the
                                                                                                              amplifiers into a 2 Ohm load. If you lack adequate current, your music reproduction will be distorted.
MODEL                                       LK 602             LK 902            LK 454         LK 654
Power Max (2 Ohms)                          175W x 2           300W x 2          125W x 4       150W x 4      Please note: The gain control of any car audio amplifier should not be mistaken for a volume control. It is
Power RMS (4 Ohms)                          110W x 2           200W x 2          75W x 4        100W x 4
                                                                                                              a sophisticated device, designed to match the output level of your audio source unit to the input level of
                                                                                                              the amplifier. Do not adjust this input level to maximum unless your input level requires it. Ignoring these
Bridged (4 Ohms) Power                      350W x 1           600W x 1          250W x 2       300W x 2      instructions will result in an input overload to the amplifier, and excessive audio distortion. It can also cause
S/N Ratio                                   103 dB             103 dB            103 dB         103 dB        The protection circuit to engage.
Low Pass Crossover (Variable)               Continuously Variable 35Hz ~ 155Hz
High Pass Crossover                         100Hz              100Hz             100Hz          100Hz         Electrical Wiring
Bass Boost (Variable)                       0~ +18dB           0~ +18dB          0~ +18dB       0~ +18dB      All IMPACT LK series power amplifiers are equipped with easy top access screw terminals. These
                                                                                                              terminals are nickel-plated in order to ensure excellent electrical contact and to resist corrosion.
Tri-mode Operation                          YES                YES               YES            YES
Inputs                                                                                                        When making electrical connections to the amplifier, please observe the following:
Remote Subwoofer Level Control              YES                YES               YES            YES            Use at least 8 gauge or heavier wire for power and ground connections.
                                                                                                               Wire the amplifier directly to the car battery. Make sure there is circuit protection (such as a fuse) on the
Frequency Response                          9Hz - 50KHz (+/- 3dB)                                              Positive power lead, within 18 inches of the battery.
THD@ RMS Output                             0.01%              0.01%             0.01%          0.01%          For the ground connection, use the shortest possible wire to a good chassis ground point.
Channnel Separation                         90dB               90dB              90dB           90dB           Wire the Remote connection to the remote turn-on lead of your equalizer or head unit. In some cases
Damping Factor                              125+               125+              125+           125+           this may be the power antenna lead of the head unit.
Fuse Values                                 25A x 1            15A x 1           15A x 1        30A x 2       Fuses
Full range pre-amp output                   YES                YES               ------         ------        Fuses protect both the amplifier and the electrical system of your vehicle from faulty conditions. If you must
Dimensions     (11-7/8"W x 2-7/8"H x ...)   10-3/8"L           14-11/16"L        13-3/16"L      16-5/8"L      replace the fuse in your ampliifier, use a fuse of exactly the same type and rating. A different type or rating may
                                                                                                              result in damage or cause a fire.

                                                       -2-                                                                                                               -3-
Mounting the Amplifier
                                                                                                                                                                                                    Low Level Input Wiring
Mark the location for the mounting screw holes by positioning the amplifier where you wish to install it and
use a scribe (or one of the mounting screws) inserted in each mounting hole to mark the mounting surface.                                                                                           Two Channel Amplifiers
If the mounting surface is carpeted, measure the hole centers and mark with a felt tip pen.
Drill pilot holes in the mounting surface for the mounting screws and insert the mounting screws into these
holes. Tighten them securely.
                                                                                                                                                                                                                                                              Low Inputs                                                                Crossover
Note: Before beginning your installation, be sure to take note of any wires, lines or other devices in your                                                                                                                     L           R                  R        L
                                                                                                                                                                                                                                                                                  Level
                                                                                                                                                                                                                                                                                                 Bass
                                                                                                                                                                                                                                                                                                 Boost            Freq
                                                                                                                                                                                                                                                                                                                                      Low Pass     High
                                                                                                                                                                                                                                                                                                                                                   Pass
                                                                                                                                                                                                                                                                                                                                                            Protect
vehicle which may be located behind any mounting surface.                                                                                                                                                        Power                                                                                      100
                                                                                                                                                                                                                                                                                                             40
                                                                                                                                                                                                                                                                                                                         145
                                                                                                                                                                                                                                                                                                                          155

                                                                                                                                                                                                                                                                                                                  35    160
                                                                                                                                                                                                                                                                                 Min Max      0 + 18 dB                                           Full
                                                                                                                                                                                                                            High Inputs
                                                                                                                                                                                                                                                                                                                                   Remote

High Level Inputs
                                                                                                                                                                                                                                                              Pre outputs
If the HIGH LEVEL INPUTS are used, do not use the LOW LEVEL RCA inputs at the same time.
The IMPACT LK series 2-Channel amplifiers use ONE High Level Input for both channels and the
The IMPACT LK Series 4-Channel amplifiers use TWO of these connectors-one for each pair of
channels.
     Two Channel Amplifiers :
                                                                                        Low Inputs                                                                    Crossover
                                                                                                                            Bass                                     Low Pass    High
                                                              L          R                  R          L                                                                         Pass

                                                                                                                                                                                                                       LEFT                                                           RIGHT
                                                                                                                 Level      Boost               Freq
                                                                                                                                          100          145
                                                                                                                                                                                          Protect
                                                   Power
                                                                                                                                          40            155

      HEAD UNIT                                              High Inputs
                                                                                                                Min Max     0 + 18 dB
                                                                                                                                            35        160
                                                                                                                                                                                Full
                                                                                                                                                                                                                       INPUT                                                          INPUT
                                                                                                                                                                  Remote



                                                                                        Pre outputs
                                                                                                                                                                                                                                                  From OUTPUT
                                                                                                                                                                                                                                                  of HEAD UNIT

                                     LEFT CHANNEL( +)
       From HEAD                     LEFT CHANNEL( -)
       UNIT                          CHASSIS GROUND
       SPEAKER                       RIGHT CHANNEL (-)
       OUTPUT
                                     RIGHT CHANNEL (+)                                                                                                                                              Four Channel Amplifiers


       Four Channel Amplifiers:                                                                                                                                                                                          CH 1/2 Crossover                                                                                             CH 3/4 Crossover
                        CHANNEL 4 (+)                                                                                                                                                                                    High        Low Pass                           CH   4   CH   2              Bass                             Low Pass      High
                                                                                                                                                                                                                         Pass                                                                                                                       Pass
                                                                                                                                                                                                                                                 Freq         Level                         Level    Boost            Freq
                                                                                                                                                                                                               Power                                                                                                                                       Protect
                        CHANNEL 4 (-)                                                                                                                                                                                                      100          145                                                  100          145

                                                                                                                                                                                                                                           40           155                                                      40          155

                        CHASSIS GROUND                                                                                                                                                                                      Full             35    160        Min Max                      Min Max   0 + 18 dB    35    160
                                                                                                                                                                                                                                                                                                                                                 Full

                                                                                                                                                                                                                                                                                                                                   Remote
                        CHANNEL 3 (-)                                                                                                                                                                                    CH 4       CH 3            CH 2        CH 1



                        CHANNEL 3 (+)                                                                                                                                                                                                High Inputs
                                                                                                                                                                                                                                                                        CH   3   CH   1

                                                           CH 1/2 Crossover                                                                                          CH 3/4 Crossover
                                                           High      Low Pass                          CH   4    CH   2             Bass                             Low Pass      High
                                                           Pass                                                                                                                    Pass
                                                                               Freq         Level                         Level     Boost            Freq
                                                   Power                                                                                                                                  Protect
                                                                         100          145                                                   100             145

                                                                         40           155                                                       40          155

                                                                             35   160                                                            35     160
                                                              Full                          Min Max                       Min Max   0 + 18 dB                                   Full

                                                           CH 4   CH 3            CH 2          CH 1                                                              Remote


                                                                                                       CH   3    CH   1
                                                                     High Inputs

                    HEAD UNIT




                                                                                                                                                                                                                                     FRONT                                                     REAR
 From HEAD                                                                                                                                                                                                                           INPUTS                                                   INPUTS
                              CHANNEL 1 (+)
 UNIT                                                                                                                                                                                                                                                              From OUTPUT
                              CHANNEL 1 (-)                                                                                                                                                                                                                        of HEAD UNIT
 SPEAKER
                              CHASSIS GROUND
 OUTPUT
                              CHANNEL 2 (-)
                              CHANNEL 2 (+)

                                                    -4-                                                                                                                                                                                                                                    -5-
Two Channel Speaker Wiring                                                                           Tri-Mode Speaker Wiring

Two Channel Amplifiers                                                                               Tri-Mode Operation is a unique feature which allows a two channel amplifier to drive a sub-woofer operated
                                                                                                     in MONO mode, while simultaneously driving full range speakers in STEREO.
                                                                                                     To engage the amplifier in this mode, place the Crossover (Subwoofer)                                Values
                                                                                                                                                                                            Component Values
                   Left
                          Bridged
                                    Right                  Batt    Rem    Gnd                        switch in the "FULL" position. Use a 100v non-polar capacitor for a high               for 6d Pas ive C
                                                                                                                                                                                                  B
                                                                                                                                                                                            for 6d Passive C
                                                                                                                                                                                                      s
                                                                                                                                                                                                  B         rosso
                                                                                                                                                                                                            rossover
                                                                                                                                                                                                                 ver
                                              Fuse
                                                                                                     pass crossover and a wire coil inductor to block high frequencies from                     e
                                                                                                                                                                                            Frequ ncy      c
                                                                                                                                                                                                        Indu tor      a
                                                                                                                                                                                                                   Cap citor
                                                                                                     the subwoofer, as shown in the figure below. Please review the table below             80Hz        7.5mH        470uF
                                                                                                     for inductor and capactior component values to determine the desired                   100Hz       6.5mH        330uF
                     Speakers                                     Power
                                                                                                     crossover frequencies.                                                                 120Hz       5.5mH        330uF
                                                                                                                                                                                            150Hz        4mH         220uF


                             +
                             +
                                                                                      GROUND
                                                                                                                                 Full Range
                                                                                                                                 Speakers
                 +                  RIGHT                                        To REMOTE TURN-ON
                                    SPEAKER
                                                                                 from HEAD UNIT                HIGH PASS                         +                     SPEAKER IMPEDANCE
                  LEFT                                                                                                                                                 4 - 8 OHMS!
                  SPEAKER                                                       To BATTERY           FILTER (CAPACITORS)           +
                                                Connect the NEGATIVE SPEAKER TERMINAL to the
                                                LEFT CHANNEL NEGATIVE AMPLIFIER TERMINAL.

                                                Connect the POSITIVE SPEAKER TERMINAL to the
                                                RIGHT CHANNEL POSITIVE AMPLIFIER TERMINAL.                                                    Bridged
                                                                                                                                       Left             Right                Batt    Rem    Gnd
                                                                                                                                                                Fuse




                                                                                                                                         Speakers                                   Power
Bridged Speaker Wiring
Two Channel Amplifiers


                          Bridged
                   Left             Right                  Batt    Rem    Gnd
                                              Fuse                                                             LOW PASS              +
                                                                                                                                     +                                                                         GROUND
                                                                                                      FILTER (INDUCTOR)                                                                            To REMOTE TURN-ON
                                                                                                                                                                                                   from HEAD UNIT
                     Speakers                                     Power
                                                                                                                                                                                                   To BATTERY
                                                                                                                                 SUBWOOFER MINIMUM
                                                                                                                                 IMPEDANCE 8 OHMS!


                  +
                  +                                                                  GROUND


                                                                                To REMOTE TURN-ON
                                                                                from HEAD UNIT
            SPEAKER IMPEDANCE
            4 - 8 OHMS!                                                         To BATTERY




                                                     -6-                                                                                                         -7-
Four Channel Speaker Wiring                                                                                                                       Tri-Mode Speaker Wiring
Four Channel Amplifiers                                                                                                                          Tri-Mode Operation is a unique feature which allows a two channel amplifier to drive a sub-woofer operated
                                                                                                                                                 in MONO mode, while simultaneously driving full range speakers in STEREO.

           CH 1
                  Bridged
                            CH 2               CH 3
                                                      Bridged
                                                                CH 4                             Batt   Rem     Gnd                              To engage the amplifier in this mode, place the Crossover (Subwoofer)                                           Values
                                                                                                                                                                                                                                                   Component Values
                                                                               Fuses                                                             switch in the "FULL" position. Use a 100v non-polar capacitor for a high                                B
                                                                                                                                                                                                                                                   for 6d Pass
                                                                                                                                                                                                                                                             sive C
                                                                                                                                                                                                                                                   for 6d Pas ive C
                                                                                                                                                                                                                                                         B         rosso
                                                                                                                                                                                                                                                                   rossover
                                                                                                                                                                                                                                                                        ver
                                                                                                                                                 pass crossover and a wire coil inductor to block high frequencies from                                e
                                                                                                                                                                                                                                                   Frequ ncy      c
                                                                                                                                                                                                                                                               Indu tor      a
                                                                                                                                                                                                                                                                          Cap citor
                                                                                                                                                 the subwoofer, as shown in the figure below. Please review the table below                        80Hz        7.5mH        470uF
                               Speakers                                                             Power                                        for inductor and capactior component values to determine the desired                              100Hz       6.5mH        330uF
                                                                                                                                                 crossover frequencies.                                                                            120Hz       5.5mH        330uF
                                                                                                                                                                                                                                                   150Hz        4mH         220uF
                                                                                                                                                 desired crossover frequencies.
                                                                                                                             GROUND

                                                                                                                                                          SUBWOOFER MINIMUM                          SUBWOOFER
                                                                                                                  To REMOTE TURN-ON                       IMPEDANCE 8 OHMS!
           Ch1                             Ch3                                                                    from HEAD UNIT
                   Ch2
         SPEAKER SPEAKER
                                                   Ch4
                                         SPEAKER SPEAKER
                                                                                                                  To BATTERY
                                                                                                                                                                                        CH 3
                                                                                                                                                                                      SPEAKER
                                                                                                                                                                                                     +                           CH 4
                                                                                                                                                                                                                               SPEAKER

                                                                                                                                                                                     +                                         +
                                                                                                                                                                 LOW PASS                                                                SPEAKER IMPEDANCE
                                                                                                                                                        FILTER (INDUCTOR)                                                                4 - 8 OHMS!
Bridged Speaker Wiring
Four Channel Amplifiers
                                                                                                                                                                                                                                        HIGH PASS
                                                                                                                                                                                                                              FILTER (CAPACITORS)
                                                                                     SUBWOOFER
  SPEAKER IMPEDANCE                                      +                             SPEAKER
  4 - 8 OHMS!                                                                                                                                                            CH 1
                                                                                                                                                                                Bridged
                                                                                                                                                                                          CH 2       CH 3
                                                                                                                                                                                                            Bridged
                                                                                                                                                                                                                      CH 4                Batt   Rem   Gnd
                                                                                                                                                                                                                               Fuses




                                                                                                                                                                                             Speakers                                        Power

                              Bridged                             Bridged
                       CH 1             CH 2               CH 3             CH 4                         Batt    Rem   Gnd
                                                                                         Fuses
                                                                                                                                                                                                           HIGH PASS
                                                                                                                                                                                                 FILTER (CAPACITORS)
                                           Speakers                                                           Power

                                                                                                                                                                                                                                                       To REMOTE TURN-ON
                                                                                                                                                                                                                                                       from HEAD UNIT
                                                                                                                                                                                                                                                       To BATTERY
                                                                                                                                                              +                                     +
                                                                                                                                  GROUND
                                                                                                                                                                                                      CH 2
                                                                                                                                                                                                                        SPEAKER IMPEDANCE
                      +
                      +                                                                                                                                         CH 1
                                                                                                                                                                                                    SPEAKER             4 - 8 OHMS!
                                                                                                                                                              SPEAKER
                                                                                                                             To REMOTE TURN-ON                           +
                                                                                                                             from HEAD UNIT               LOW PASS
                                                                                                                             To BATTERY          FILTER (INDUCTOR)
                      SUBWOOFER                                                                                                                                                                     SUBWOOFER MINIMUM
                        SPEAKER                                                                                                                                         SUBWOOFER                   IMPEDANCE 8 OHMS!

         SPEAKER IMPEDANCE
         4 - 8 OHMS!

                                                                                   -8-                                                                                                                                       -9-
Precautions                                                                                                                                               Troubleshooting
Before you drill or cut any holes, investigate your car's layout very carefully. Take care when you work near
                                                                                                                                                          Before removing your amplifier, refer to the list below and follow the suggested
the gas tank, fuel lines, hydraulic lines and electrical wiring.                                                                                          procedures. Always test the speakers and their wires first.

Do not operate the amplifier when it is not mounted. Attach all audio system components securely within                                                   No Output        Confirm that all terminal strip connections are secure and tight.
the automobile to prevent damage, especially incase of an accident.
                                                                                                                                                                           Check both in-line and built-in fuses. Both the "+12V" and the "REMOTE" terminals must
Do not mount this amplifier so that the wire connections are unprotected or in a pinched condition, or likely                                                              have +12V referenced to chassis ground.
to be damaged by nearby objects.
                                                                                                                                                                           Confirm that the audio signal source (car radio, equalizer, etc.) is connected and is supplying
                                                                                                                                                                           output signal. To check if the amplifier is supplying signal, unplug the RCA cables from the
Before making or breaking power connections in your system, disconnect the vehicle battery. Confirm that                                                                   signal source (but leave them plugged into the amp). Gently tap the center pin of each of
your head unit or other equipment is turned off while connecting the input jacks and speaker terminals.                                                                    the disconnected RCA plugs with your finger. This should produce a noise (feedback) in
                                                                                                                                                                           your speakers.
If you need to replace the power fuse, replace it only with a fuse identical to that supplied with the system. Using a fuse of
different type or rating may result in damage to your system which isn't covered by the manufacturer's warranty.
                                                                                                                                                          Only one        Confirm that all speaker strip connections are secure and tight.
                                                                                                                                                          channel         Check the "BALANCE" control on thehead unit (or other source) to verify that it is set to
                                                                                                                                                          works           its midpoint.

Mounting feet                                                                                                                                                             If you are using the Low Level RCA Inputs, reverse the input plugs at the amplifier
                                                                                                                                                                          (switches the R with the L). If the channel which is silent switches to other side,
The amplifier is provided with four plastic mounting feet that are to be inserted in the lower slot of the                                                                the problem is either in the head unit/other source or the connecting tables.
chassis; please pay attention that right and left feet are different.

                                                                                                                                                          Weak Output Readjust the Input Sensitivity Control to better suit the input signal.

                                                                                                                                                          Noise in the If the noise is a "whine" whose pitch follows the engine speed, confirm thathe
                                                                                                                                                                                                                                                 t
                                                                                                                                                          Audio                                              s
                                                                                                                                                                       amplifier and any other signal source ( head unit, etc.) are properly grounded.

                                                                                                                                                                          If the noise is a "clicking" or "popping" noise whose rate follows the engine speed, this
                                                                                                                                                                          usually means that the vehicle is equipped with resistor spark plugs and wires, or that
                                                                                                                                                                          the ignition is in need of service.

                                                                                                                                                                          Check the routing of the speaker and input wires to make sure they are not adjacent to
                                      Pow
                                         er    L
                                                     R
                                                            Low
                                                            R
                                                                Inputs

                                                                       L
                                                                                                                                                                          wires which interconnect lights and other accessories.
                                              High                           Level
                                                   Inputs                               Bass
                                                                                        Boost
                                                                                                         Freq             Crosso
                                                                            Min
                                                                                  Max               100                  Low    ver
                                                                                                                               Pas
                                                                                                    40
                                                                                                                145               s    Hig
                                                                                        0 +
                                                                                            18 dB               155                    Pash
                                                                                                      35                                   s
                                                            Pre                                            160
                                                                  outpu
                                                                       ts                                                                      Protec
                                                                                                                                                      t
                                                                                                                      Rem             Full
                                                                                                                         ote




                                                                                                                      -10-                                                                                      -11-

				
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