400M Power Amplifier
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8
Rear Panel Layout
Figure 1: Rear panel of N
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400M Mono Power Amplifier
The rear panel will look similar to Figure 1 (above).
Each channel has one balanced (differential) input
on an XLR connector and one unbalanced (single-
ended) input on a RCA connector. There is no
switch to toggle from balanced mode to single-
ended mode. You may operate the amplifier in
either mode, but only one mode at one time. When
you’re using the balanced XLR inputs,
you must
first remove the factory installed “dummy”
XLR jumpers
(see figure 2 below) from the back
panel XLR connectors and store them in a safe
place. This jumper is required ONLY when using the
single-ended RCA input. When you decide to switch
to single-ended input mode, you must reinstall the
XLR jumper (between pins 1 and 3) exactly as
shown below:
Figure 2: XLR connector without and with jumper accessory
The left side of the rear panel has a pair of 12 Volt
triggers, each on a 1/8” mini-jack; one input and
one output, the latter for use if you need to “daisy
chain” a second power amplifier on the same trigger
circuit. Immediately to the right of these 12V
triggers is an RS-232 input on a DB9 connector.
In the middle of the rear panel you will find a pair of
heavy duty gold-plated speaker binding posts.
On the far right side, you will find (from top to
bottom); The power “main switch”; The “AC Fuse”
socket cover and the “AC in” IEC receptacle for the
power cord.
