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					Component values 4-way Linkwitz-Riley filters

Crossover frequencies :                                 Min         Max
                                         Sub :           20         160   Hz
                                        Bass :          160         850   Hz
                                         Mid :          750        4000   Hz
                                        High :         4000       30000   Hz

                                        x2
            R1               3751                ohm          3k3 + 1k pot
            C1                  1                nF
            R2              56270      112540    ohm          27k + 27k + 5k pot    68k + 39k + 10k pot
            C2                100                nF
            R3              28135                ohm          27k + 2k pot
            C3                  1                nF
            R4              68206      136412    ohm          56k + 10k + 5k pot    120k + 12k + 10k pot
            C4                2.2                nF
            R5              60182                ohm          56k + 1k8 +5k pot
            C5                2.2                nF
            R6              70337      140674    ohm          68k + 5k pot          120k + 15k + 10k pot
            C6                 10                nF
            R7              70337                ohm          68k + 5k pot
            C7                 10                nF
            R8              28135       56270    ohm          27k + 2k pot          47k + 6k8 + 5k pot
            C8                  1                nF

Remarks :

1. All capacitors are precision or selected film types.
2. All resistors are 1% metal film.
3. All trim potentiometers are of cermet type.
4. I recommend to build the filter without trim potentiometers and use precision capacitors and resistors. You will save a tremendous
5. Utmost care should be taken in the grounding of the filter PCB : I had to ground the balanced input ground to the chassis to elimin
6. Place the power supply (especially the transformer which should be of a toroidal type) as far as possible from the filter PCB. Plac
7. Use a metal housing to shield the circuit from external fields.
8. All filters have an inband gain of 1. I added attenuators on the outputs of the filters that adjust the levels according to amplifier ga
8. The output attenuators, which also use ceramic potentiometers, have a range of +/- 3 dB around the optimal value.

Luc Henderieckx
6-Jun-99
 pacitors and resistors. You will save a tremendous lot of work !
d the balanced input ground to the chassis to eliminate hum.
al type) as far as possible from the filter PCB. Place extra shielding if needed.

 ers that adjust the levels according to amplifier gains and speaker sensitivities.
of +/- 3 dB around the optimal value.

				
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posted:11/23/2011
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