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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 (6) to "LPF". Set the
desired cross-over frequency with the control (5). 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 (6) to "HPF". Set the desired cross-over
frequency with the control (7). 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.
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