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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.
5.3 HIGH-PASS FILTER WITH ADJUSTABLE CROSS-OVER FREQUENCY
If the amplifier is to be used as an amplifier for satellite loudspeakers (mid-range/tweeter loudspeakers),
set switch (7) to "HPF". Set the desired cross-over frequency with the control (5). Only the frequencies
above the set cross-over frequency will then be amplified. This effectively minimizes distortions caused by
excessive membrane movement at low frequencies and small satellite loudspeakers without reducing the
bass level.