User manual SAL XPRO 4000

[. . . ] For enhancing the transmission of bass frequencies the amplifier also has an adjustable SUPER BASS boost circuit. Electronic sound switch The amplifier can be used universally because of the three-state adjustable active sound switch. The sound switch allows you to use it either as a traditional amplifier to drive broadband car speakers, or to separately drive bass or mid+treble speakers only. [. . . ] 75 mm2) GND: ground (-) REM: remote control* B+: +12 Volt * If your car stereo has no 12 V output for this purpose, connect this point to the power cable. In this case, however, it is recommended to either put a switch before the remote control’s connection, or to take the control signal from a location which has no voltage when the ignition is off. Otherwise the amplifier would be on all the time, draining the car’s battery. GB XPRO 4000 owner’s manual • page 04 • black 4 Installation – troubleshooting Before turning on the power, make sure you have connected everything correctly. The connections should be solid and must not short-circuit; the switches and controls should be in the correct position. The green light (POWER) is lit continuously after switching on; the red light (PROTECTION) only comes on when the protective circuits are activated. The red light indicates malfunction, overload, incorrect connection etc. If the green LED is not on, disconnect the amplifier from the power, disconnect the speakers and the car stereo, and connect the power again. If the light is still off, use a voltage meter to make sure the amplifier receives the 12 V power and the ground connection is also correct. If your car stereo has a separate remote control output (REMOTE) which is connected, you need to check the control signal as well. By connecting the power, the car stereo and the speakers again one by one, you can identify the unit or cable which causes the fault. If you hear various noises from the system after turning down the volume, first unplug the RCA connectors from the amplifier. If the noises are still audible, make sure the amplifier is adequately grounded. If the noise disappears after unplugging the RCA cables, its source is outside the amplifier. Possible causes are: ground loop; bad ground contact at the head unit, equalizer or sound switch, or at another device in the audio frequency chain. A faulty circuit-breaker, old battery, bad ignition cables or bad contacts can all cause audible noise in the amplifier. Adjusting the input signal level Set the GAIN control to MIN with a screwdriver. Slowly start turning the GAIN control clockwise until you start to perceive acoustic distortion at the peaks of the audio signal. [. . . ] €R” zvočna škatla (2-4 Ohm) Mono (sub-bass) mode GB Mono-(Sub-Bass) Betrieb D When driving a single sub bass box, you must connect it in a bridge circuit to the two BRIDGE -/+ poles on the side as shown on the diagram. Set the sound switch selector to LPF, and adjust the LPF control as required. Vezivanje bas-hiše v most (najmanjše 4 Ohm-a) Mono (sub-bass) mode GB Mono-(Sub-Bass) Betrieb D If you want to use the amplifier for a sub bass box and the head unit has a sub bass output, you must connect it to the low-level inputs through a distributor (not included). [. . . ]