MAC Audio APM 4.0 Mode D'emploi page 10

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 controls (6) and (10) 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 (3) to „LPF". Set the desired cross-over frequency using the control (4). 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 (3)/(11) to „HPF". Set
the desired cross-over frequency using the control (2)/(12). 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.
5.4 BAss-Boost
The bass-boost function (5) is used to increase or equalize the lower bass frequencies.
5.5 outPuts for ConneCting AdditionAl AMPlifiers
The input signal of the INPUT connections CH1 and CH2 (9) is forwarded directly to the OUTPUT (8) CH1 and CH2 jacks. The OUTPUT
connections allow the use of additional amplifiers without requiring additional T-plugs and cables.
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