4.2 AUDIO CABLES
When installing the audio cable between the cinch output of your car receiver and the cinch
input of the amplifier inside your car, the audio and power supply cables should, wherever
possible, not be routed along the same side of the vehicle. We recommend an isolated
installation, e.g. routing the power cable through the cable duct on the left-hand side and the
audio cable through the cable duct on the right-hand side or vice versa. This reduces
interference due to crosstalk into the audio cables.
4.3 LOUDSPEAKER CONNECTIONS
· In normal operating mode (i.e. one loudspeaker on each individual amplifier channel), the
lowest terminal resistance is 2 ohm per channel.
· In bridging mode (two amplifier outputs combined) the lowest terminal resistance doubles
to 4 ohm.
· The impedance in tri-mode may not fall below 2 ohm per channel.
· Never connect the loudspeakers’ minus terminals to the vehicle chassis.
· Never connect the +12 V supply voltage to a loudspeaker output as this would destroy the
amplifier final stage.
If the amplifier is operated with lower terminal resistances or incorrectly used as described
above, both the amplifier and the loudspeakers may be damaged. The warranty becomes
void in such cases.
5. OPERATING ELEMENTS AND IN/OUTPUTS
5.1 SETTING THE INPUT SENSITIVITY
The input sensitivity may be adapted to any car radio or tape deck. Turn the volume control
of your radio to its central position and then adjust the input-level control (3) to produce an
average medium volume. This setting usually provides sufficient power reserves at optimum
weighted noise voltage.
ATTENTION: only reproduce loud test noises briefly to prevent damaging the loudspeakers.
5.2 LOW-PASS FILTER WITH ADJUSTABLE CROSS-OVER FREQUENCY
If the amplifier is used as a subwoofer amplifier, set the switch (7) to “LPF”. Set the desired
cross-over frequency with the control (6). This makes the filter adaptable to the installed
woofer’s sound requirements.
The filter’s high edge steepness is responsible for the precision reduction of medium and high
frequency ranges.
