REAR SIDE
Power amplifi er input connectors
XLR connectors (male) are provided for “Looping” the signal to other power
amplifi ers. These are wired parallel to the XLR input connectors in each
channel.
The inputs of the power amplifi er are electronically balanced and wired
according to IEC 268. Isolation transformers can be retrofi tted in order
to avoid hum interference in larger sound reinforcement systems. Please
contact your dealer if you have any problems.
Input wiring XLR
PIN 1: SHIELD
PIN 2: a, +, hot
PIN 3: b, -, cold
The inputs are electronically balanced.
The input sensitivity is set to 0dBu (775 mV) by the factory and can be
altered to +6 dBu (1.55V) or +26 dB gain by means of internal jumpers.
INPUT ROUTING
PARALLEL MONO
If the mode selector is in position PARALLEL MONO, the input connectors
channel A und B are directly wired in parallel, but the volume for channel A
or B can be adjusted independently using the input controls A or B.
DUAL STEREO
If the mode selector is in position DUAL STEREO, channel A and B are
amplifi ed separately.
REAR PANEL
Many mixing consoles have XLR connectors in the outputs, but are wired in such a way
that they are unbalanced. If a mixer is used with unbalanced outputs, PIN 1 and PIN 3 of
the power amplifi er’s input connectors must be connected by a jumper or PIN 3 must not
be connected to the connection cable.
If signals are taken from unbalanced units via PIN 3 (b, -, cold) and PIN 2 (a, +, hot),
strange hum interference or high frequency oscillations can occur. These effects can
cause power amplifi ers or loudspeakers to malfunction.
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