MAC Audio FEARLESS 4000 D Owner'S Manual Download

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The +12 V amplifier connection must then be connected with a power cable possessing an integrated fuse to the battery’s plus pole. The
fuse must be located close to the battery, the length of cable from the battery’s positive pole to the fuse must be less than 60 centimetres
for safety reasons. Only insert the fuse when all installation work, including the connection of the loudspeakers, has been completed.

Now connect the car hi-fi receiver’s remote control connection to the amplifier’s REM control jack. A cable with a cross-section of 0.75 mm²
is sufficient for connecting the amplifier’s REMOTE connection and the control device.

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.

This also applies to the connecting cable for the remote control for regulating the volume of the rear channels. This cable should not be
laid on the side of the power supply leads but together with the audio cable.

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.

OPERATING ELEMENTS

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 is central position and then
adjust the input-level control (2) 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

Set the switch (5) to “LPF” if you want to use Channels CH1/2 or CH3/4 respectively for the subwoofer amplifier. Set the desired cross-
over frequency with 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 precise reduction of middle 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 (5) to „HPF“. Set the
desired cross-over frequency with the control (4). 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 elevates or distorts the lower bass ranges. Infinitely variable accentuation level using control (3).

5.5 OUTPUTS FOR CONNECTING ADDITIONAL AMPLIFIERS

The cinch-connectors labelled “LINE OUTPUT” may be used to hook up additional amplifiers without any need for cable splitters or T-
connectors.

5.6 REMOTE CONTROL FOR REGULATING THE VOLUME OF THE REAR CHANNELS

The volume of the rear channels (the outputs designated CH3 and CH4) can also be regulated using the remote control supplied. When
fitting this device, it must be ensured that the remote control cable is not laid on the same side of the vehicle as the power supply for the
amplifier (see Chapter 4.2). The remote control should be installed on the dashboard or other easily accessible location. If the rear channels
are used to operate a subwoofer, the volume of the subwoofer can be adjusted independently of the settings on the car radio. Use is
recommended in the layout shown in fig. 3.

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