10
AUDIO SIGNAL CABLES
When installing the audio cables between the RCA outputs of the head unit and the RCA inputs of the amplifier,
the audio and power supply cables should, if possible, not be routed along the same side of the vehicle. We
recommend a separated installation, e.g. routing the power cable through the cable channel on the left side
and the audio cables through the cable channel of the vehicle on the right side or vice versa. This prevents
interferences due to crosstalk into the audio signal.
INPUT SENSITIVITY
OPERATING ELEMENTS
Turn the INPUT LEVEL (Fig. 1,3) controller of the amplifier to the MIN position. Then turn the volume controller
of the head unit to 80 - 90% of its full setting. Now turn INPUT LEVEL clockwise until you hear some distortion.
Then turn back the INPUT LEVEL slightly until you hear a cleaner sound.
VARIABLE HIGH PASS FILTER
If the amplifier is to be used for mid-range/tweeter loudspeakers, set the switch X-OVER (Fig. 1,2) to HPF.
Then set the desired cross-over frequency on the FREQUENCY controller (Fig.1,1). Thus to that only the fre-
quencies above the chosen cross-over frequency will be amplified. This effectively minimizes distortions and
overloads at lower frequencies. A good point to start is at 125 Hz.
If you use loudspeakers (>20 cm) set X-OVER (Fig.1,2). to ”OFF”. In this case, the FREQUENCY controller is
without function (Fig.1,1).
VARIABLE LOW PASS FILTER
If the amplifier is used to drive a subwoofer, set the switch X-OVER (Fig. 1,2) to „LPF“. Set the desired cross-
over frequency by using the FREQUENCY controller (Fig. 1,1). Thus to that only the frequencies below the
chosen cross-over frequency will be amplified and the subwoofer plays more precisely and efficient.
AUTO TURN ON
The amplifier detects a voltage rise (6 Volts) with a so called ”DC Offset” over the connected input signal on the
HIGH LEVEL INPUTS (Fig. 1,5) when the head unit will be switched on. Hence, the amplifier will also be turned
on. As soon as the head unit will be turned off, the amplifier turns also automatically off. In this case the turn-on
connection (REM, Fig. 2,1) is not needed.
NOTE:
The Auto Turn On function usually works with 90% of all head units, because they are equipped with
”High Power”-outputs. Only with a few older and still existing head units the Auto Turn On function is not work-
ing.
HIGH LEVEL INPUTS
The HIGH LEVEL INPUTS (Fig. 1,5) is suitable to connect the device input with speaker wires, if your head unit
is not equipped with pre-amplifier RCA outputs. Extend therefor every regarding speaker cable from your head
unit with appropriate speaker cables from your car audio retailer to the mounting location of the amplifier. Then
connect the each matching loudspeaker cable with the cables of the included HIGH LEVEL INPUT jack and set
the switch INPUT (Fig. 1,6) to position HIGH.
CAUTION:
Never use the HIGH LEVEL INPUTS and the RCA inputs at the same time. This may damage
the device seriously. The loudspeaker cables of the HIGH LEVEL INPUT must have no contact to the ground
(GND) by any means.
