USERS MANUAL Arco-amplification B510 This amplifier is designed for the double bass jazz player. It delivers clean power, so your bass sounds clear and natural. The frequency spectrum covers the bass range, and the combo amplifier has a warm sound belying its small size. The amplifier is extremely powerful, and this gives a relaxed feeling, easing your playing experience. 1) Hi-Z and Lo- Z inputs, for different types of pickups and signals. Normally, use the Hi-Z input. 2) Tone switch, alters the basic sound of the combo, between dark, normal and bright. 3) Gain control, changes the sensitivity on the input, and also works with the compressor. The gain control determines how much signal is send to the balanced out, and the “send” jack. 4) Phase switch. Reverses the sound wave coming through the speaker, and other outputs. It has a great effect on how the double bass sounds and feels, and it can also get rid of feedback problems. Flip the switch until you get the best sound. 5) Compressor. An optical compressor circuit, based on vintage technology, gives you a mild compression. It’s activated by the switch, and the more you turn up the gain control the more compression you get. Use the master volume for your general volume setting. 6) Bass, gives you +/-20 decibels of variation in the bass frequencies, and determines how full bodied or thin your sound gets. 7) Lo-Mid, gives you +/- 20 decibels of variation in the low middle register. This filter affects the core sound of the bass. Boosted it will give you a very punchy sound, and backed off it will make the sound more transparent. 8) Hi-Mid, gives you +/- 20 decibels of cut and boost in the high middle register, and it affects the amount of attack and pizzicato sounds in your signal. It can make the sound more or less aggressive. Back it off and your bow (arco) sound will feel more natural. 9) Treble controls the amount of high frequencies in your signal, and has a 20 +/- db variation. It can make your sound dark or bright ore anything in between. 10) Lo-cut, cuts the deepest frequencies, and is made to help rumbling problems in difficult rooms. 11) Master, is the general volume control that determines the loudness of the speaker and the power distributed to the speaker sockets. It does not affect the levels on balanced lineout and send. 12) Mute, is a switch that mutes everything happening in the combo amplifier, except the tuner output. You can tune up your instrument, without any sound leaking out, and you can mute the amplifier, during intermissions, leaving all controls ready to go. 13) Tilt, is found at the bottom of the cabinet. Pull the handle, tilt, and change the sound projection. 14) Tuner out. Connect your tuner to this socket. Will also function as a direct out connection. 15) Send/return, are sockets that switch off the internal effects, so you can connect outboard effect devices. 16) External speaker sockets. Connect your extra speaker and release the full 500 watt RMS potential, so you can get really loud. The “jack” socket disconnects the internal speaker. The “Speakon” socket leaves it on. Specifications: dimensions 360x320x300 mm. Weight 8,9 kilos. Loudspeaker: 8” neodymium. Output power: 250 watts RMS. 8 ohms/500 watts RMS. 4 ohms. Voltage: 115/230 volts AC. Fuse: 5A slow. Change voltage inside amp, by moving jumper from 115 volt socket to 230 volt socket, on power module. Voltage change should only be done by qualified person. Use of 230 volt AC at 115 volt AC position, destroys amplifier, and voids guaranty. Accessories: Soft cover with zipped pocket, and 230 volt IEC cable, 3 meters. WARNINGS: Dont expose G508 to rain or moisture. Always use correct fuse /5Amp). Never run G508 on less than 4 ohms total speaker impedance. Never connect another amplifiers speaker-output to speaker outputs on G 508. AC volt change: Your Arco-amplification combo, will work at any voltage from 85 volt AC to 250 volt AC. It will function all over the world. The voltage spectrum is divided into two levels: 115 and 230 volts AC. In order to get the right voltage, you need to select either 115 volts or 230 volts. To avoid accidental 230 volts at the 115 volts position, and possible destruction of the amplifier, the voltage selection is done inside the amplifier. 1) Unscrew the black “Phillips screws” that attaches the grey control panel to the back of the cabinet. 2) Carefully lift the panel out and place it at the tabletop behind the cabinet. 3) Look at the supplied picture and locate the jumper that determines the voltage. Place it at your desired position, end re-attach the panel to the cabinet. 4) REMEMBER! Returning from a 100-115 volt country you have to switch back to 230 volt! 5) Malfunction due to application of wrong voltage, will void the guaranty.