MAC Audio APM 2.0 Bedienungsanleitung Seite 10

4.3 COnneCting tO A CAr rADiO WitHOut CinCH OutPuts
When connecting a car radio without low-level cinch outputs (cinch jacks), use the supplied adapter to connect the
car radio amplifier's final stages to the amplifier's high-level input marked with HI INPUT. Make sure that the correct
poles are used for the connections as otherwise the amplifier may be damaged.
important notice: Never connect the car radio to the low-level AND the high-level inputs simultaneously (HI INPUT
and INPUT). Either use the low-level OR the high-level input. If your car radio possesses low-level outputs, these
should preferably be used due to the improved tonal response and interference voltage distance.
4.4 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 cen-
tral position and then adjust the input-level control (4) 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 (8). 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 L and R (1) is forwarded directly to the OUTPUT (2) L and R jacks. The
OUTPUT connections allow the use of additional amplifiers without requiring additional T-plugs and cables.
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