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Mac Audio MPX 2500 Manual

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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.
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