Service manual

4
solve the problem, check your output
cables and speakers.
4. Signal “Status” LED Indicator
Each channel of the MAR 1 features a
signal LED to show that there is an audio
signal at the input to the channel. The
threshold for the indicator is –26 dB,
which should be enough to avoid noise
triggering the LED.
5. Power Switch
The power ON/Off switch with an LED
indicator.
Always start with Gain Control (1) all
the way down before powering-up to
avoid abnormal sound from defective
cables or hookups.
Back Panel Description
6. Ch1/Ch2 Input (Neutrik
Connector)
Quality Neutrik Connectors are provided
for balanced XLR and 1/4” inputs, which
are commonly, used for both mobile and
installation set-ups. They provide a good
combination of ease of connection and
resistance to corrosion. The XLR inputs
are wired as per the following convention:
These type of jacks feature on much
audio equipment and are convenient if the
amp is frequently connected and
disconnected, such as for mobile set-up.
The plugs used should wired as per
the following convention:
7. Stereo/ Parallel Switch
In Stereo operation, two separate signals
are treated separately by Channels 1 and
2 of the amplifiers.
In Parallel operation, One signal is
treated by both channel 1 and 2 of the
amplifier. In other words, a signal
connected to Input Ch1 or Ch2 (6) is sent
to both Output Ch1 and CH2 (9).
This switch should be used when the
+
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gnd
tip
ring sleeve
+
-
gnd
6
7
8
9