MAC Audio Z 4100 Mode D'emploi page 13

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 controls (3) and (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 (9)/(10) to "LPF". Set the desired cross-
over frequency using the control (7)/(8). 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 (9)/(10) to "HPF". Set the desired cross-over frequency using the control (11)/(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 (5/6) 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 / CH2 (1) is forwarded directly to the OUTPUT (14) jacks. The
OUTPUT connections allow the use of additional amplifiers without requiring additional T-plugs and cables.
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