XPRO 4000 owner’s manual • page 04 • black
4
GB
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 needed, make sure the fuse is not blown.
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. Turn on the car stereo and set the volume to approximately 3/4. Slowly
start turning the GAIN control clockwise until you start to perceive acoustic distortion at the peaks of the audio signal. When
reaching this point, turn backwards a little. You have now set the maximum volume of the system which is transmitted in good
quality and without distortion. The setting of the GAIN control depends on the level of your car stereo’s output signal, therefore
it may vary from device to device.
If you set the GAIN control to a higher level, the output power of the amplifier will no longer increase and the maximum volume
you can use with the car stereo will be lower because of the system’s increased distortion.
Connecting further amplifier(s)
The RCA output sockets of the amplifier labeled OUT provide the same signal that is connected to the REAR IN L+R
sockets next to them. This allows you to connect one or more further amplifiers.
An example for this is an arrangement where one amplifier drives the two broadband speakers in the rear, and the other
one is used for the bass box in a bridged connection.
Warnings
THE INSTALLATION OF CAR STEREO EQUIPMENT REQUIRES IMPORTANT TECHNICAL SKILLS AND EXPERTISE, WHICH
CANNOT BE COVERED IN THIS MANUAL. IF NECESSARY, CONSULT AN EXPERT TO AVOID CAUSING DAMAGE TO THE
AMPLIFIER OR YOUR CAR. THE AMPLIFIER WILL ONLY WORK CORRECTLY IF IT IS INSTALLED IN A PROPER WAY.
THE WARRANTY DOES NOT COVER DAMAGES RESULTING FROM IMPROPER INSTALLATION AND CONNECTION.
NEVER COVER THE AMPLIFIER AND ONLY INSTALL IT IN A PLACE WHERE ADEQUATE VENTILATION IS ENSURED.
PROTECT THE DEVICE FROM SUNLIGHT, DUST, HUMIDITY AND WATER.
THE NEGATIVE POLE OF THE SPEAKERS MUST NOT GET IN CONTACT WITH THE CAR’S GROUNDING (THE BATTERY’S
NEGATIVE POLE).
THE AMPLIFIER’S PROTECTIVE CIRCUITS MIGHT GET ACTIVATED AND SHUT OFF THE AMPLIFIER WHEN THE
ENVIRONMENT TEMPERATURE IS EXTREMELY HIGH OR LOW (E.G., WHEN PARKING IN THE SUN IN THE SUMMER OR
WHEN THE CAR BECOMES COLD IN THE WINTER). IN THIS CASE LEAVE THE AMPLIFIER TURNED OFF UNTIL NORMAL
ENVIRONMENT TEMPERATURE IS RESTORED.
DO NOT USE THE AMPLIFIER FOR A PROLONGED PERIOD OF TIME WHEN THE ENGINE IS NOT RUNNING AS THIS CAN
DRAIN THE BATTERY.
ALWAYS USE THE AMPLIFIER AT A VOLUME THAT DOES NOT AFFECT YOUR PARTICIPATION IN TRAFFIC AND DOES NOT
DAMAGE YOUR HEARING. MANY CAR STEREO SYSTEMS ARE CAPABLE OF EMITTING AUDIO PRESSURE IN EXCESS OF
130 DB, BUT SOUND STRONGER THAN 100 DB CAN PERMANENTLY DAMAGE YOUR HEARING.
ONLY USE AN IDENTICAL FUSE FOR REPLACEMENT.
THIS DEVICE CAN ONLY BE USED WITH A 12V POWER SOURCE WITH NEGATIVE GROUNDING.
