MAC Audio MICRO XL 4000 Bedienungsanleitung, Garantie Seite 8

First connect the amplifier's GND terminal to the battery's minus pole. It is very important that the connection is good. Dirt residues must
be carefully removed from the battery's connection point. A loose connection may cause malfunctions or interference noise or distortion.
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 should be located close to the battery; for safety reasons, the cable from the positive terminal of the battery to the fuse must not
exceed 60 cm in length. 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.
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 (7) 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 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 (4)/(9) to "HP". Set the
desired cross-over frequency using the control (5)/(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.
5.3 BAND-PASS FUNCTION FOR CHANNELS 3 AND 4
The filters integrated in channels 3 and 4 may be used as a band-pass by activating the high-pass and low-pass filters simultaneously.
The selector (4) must be in its position "LP/BP". Controls (5) and (3) may now be used to set the lower and upper limit frequencies of the
resulting band-pass. This function can be used to drive a subwoofer (high-pass regulator (5) at 10 Hz) or to realise a bass kick response
(high-pass regulator (5) at approx. 80 to 100 Hz). Adjust the low-pass regulator to the desired crossover frequency.
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.
By selecting filter setting "LP/BP" the signal from channel 3 and 4 is accumulated and passed to both power amplifiers at channels 3 and
4. The audio signal is thereby optimised for operating subwoofers in a bridge circuit.
5.4 BASS-BOOST FOR CHANNELS 3 AND 4
The bass-boost function (2) is used to increase or equalize the lower bass frequencies.
5.5 FILTER SELECTOR CHANNEL 1 AND 2 (9), FILTER POSITION CLONE
When set to the CLONE setting, channel 1/2 receives the input signal from the preamplifier of channels 3/4 and transfers the filter settings
and volume settings from channel 3/4 (bandpass or highpass, bass boost).
5.6 SELECTOR SWITCH FOR CHANNEL MODE 2CH/4CH (6)
When set to the 2 channel mode (switch position "CH2"), channel 1/2 of the amplifier receives the input signal from the RCA jacks of
channels 3/4. The selector switch means the use of additional T-plugs is unnecessary.
5.7 OUTPUTS FOR CONNECTING ADDITIONAL AMPLIFIERS
The input signal of the LINE INPUT connections CH1, CH2, CH3, CH4 (11 and 12, Fig. 7) is accumulated and forwarded directly to the
OUTPUT (1) jacks. The OUTPUT connections allow the use of a subwoofer amplifier without requiring additional T-plugs and cables.
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