SAL VPRO 9000, Instruction Manual, Page: 4 / 24

VPRO 9000 & 5000 owner’s manual • page 04 • black
4
GB
POWER
GROUND : ground (-) +REMOTE : remote control* POWER : +12 Volt
* If your car radio does not have a 12 Volt output for this purpose, connect this point to the +12V power voltage. In this case,
it is recommended to either install a switch before the remote control input, or to connect the control voltage to a point that
is powered off when the ignition key is removed. Otherwise the amplifier will be permanently on, putting a drain on the battery.
Installation and troubleshooting
Before powering up the amplifier verify that it is connected correctly. Connections should be stable and without short circuits,
and the switches and controls should be in the correct position.
The POWER light indicates that the amplifier is on, and the PROTECT light shows that the protective circuits are active. The
latter indicates that the amplifier is malfunctioning, overloaded, or incorrectly connected. In that case, disconnect the amplifier
from the power immediately.
If the POWER LED is not lit up at all, disconnect the amplifier, disconnect the speakers and the car radio, and power up
the amplifier again. If the light is still off, use a voltage meter to make sure that the amplifier does in fact receive the 12 V
power, and that the ground connection is stable. If the car radio has a separate remote control output and you connected it
(REMOTE), also verify the presence of the control signal.
Connecting the power, the car radio and the speakers again one by one you can identify the faulty unit or cable. If needed, also
verify that the fuse(s) are in good condition.
If the system emits noises, turn the volume down, and first unplug the RCA connectors. If you still hear the noise, make sure
the amplifier is correctly grounded.
If the noise stops, that means the source is outside the amplifier. Possible causes include: a ground loop, a contact fault in
the head unit's ground, at the audio processor, at the sound switch, or at another device in the audio frequency chain. A faulty
circuit breaker, old battery, damaged ignition cables or faulty contacts can all be sources of audible noise.
Adjusting the input signal level
Set the GAIN control to MIN. Turn on the car radio and set its volume control to approximately 3/4 . Slowly start turning the
GAIN button clockwise until you start to hear distortion at the acoustic peaks. Then turn it counter-clockwise a little. This will
be the system's maximum volume which is emitted in good quality without distortion. The correct GAIN setting depends on the
signal level of the car radio's output, and may vary from type to type.
By further increasing the GAIN level the system's output power does not increase any further; instead, the maximum usable
volume on the car radio becomes lower because the system's distortion grows. A distorted signal can damage the speakers.
Remote controlled bass volume
In LPF mode you can also adjust the input signal level using the control that comes with a 4.5 m cable. Mount the
external unit under the dashboard in a position that does not hinder you during driving. Connect the cable to the
amplifier's REMOTE socket.
This scheme makes it possible to comfortably adjust the volume from the driver's seat when the strength of bass
sounds changes between songs or albums, allowing you to enjoy a perfect bass sound at all times.
Connecting further amplifiers
The OUTPUT RCA sockets of the amplifier emit the original input signal that is connected to the LOW INPUT sockets next to
them. This allows you to connect one or more additional amplifiers.
Warnings
• Installing a car hi-fi system requires important professional skills and experience, which are not covered in this manual.
If needed, consult a technician to avoid damaging your system or the vehicle. Proper installation is essential for the
system's reliable operation.
• The warranty is not applicable to damage caused by improper installation or connection.
• Never cover the device and only install it in a location with proper ventilation.
• Protect from sunlight, humidity and water.
• The speaker's poles must have no connection to each other or the car's body (negative pole).
• Especially when the temperature in the amplifier's environment is extremely high or low (e.g., when the car is parked in
direct sunlight in the summer, or at freezing temperatures in the winter) the automatic protective circuit may become
active and turn off the amplifier. In that case, leave the amplifier turned off until normal environment temperature is
restored.
• Do not use the amplifier for a long time when the engine is not running, as that may drain the battery.
• Always listen to your sound system at a volume that does not disturb your participation in traffic and does not damage
your hearing. Many car hi-fi systems are capable of emitting sound pressure over 130 dB. However, levels above 100 dB
can damage your hearing permanently.
• When replacing the fuse, always use an identical type.
• This device can only be used with a 12 Volt power source where the negative pole is grounded.
• Clean with a soft, dry cloth.