Plinius Audio SA-250 - Manual (Page 15)

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Now turn the ACS switch fully clockwise then two positions counter-clockwise so that it is in the XLR
Stereo position. It is now safe to switch on your amplifier.
XLR BALANCED MONO
As with RCA Bridged Mono, this option configures your amplifier to drive one loudspeaker, but from one
balanced line input connected to the RIGHT XLR Input. In balanced mono mode the only input made to
your preamplifier is to the RIGHT channel XLR input. The LEFT channel XLR input is not connected.
Next your loudspeakers are connected to both positive (+) channel output terminals. So the positive red
connection on your loudspeaker is connected to the red RIGHT amplifier output, and the negative black
connection on the loudspeaker should be connected to the red LEFT amplifier output. DO NOT CONNECT
ANYTHING AT ALL TO THE NEGATIVE (-) TERMINALS. MAKING A CONNECTION TO THE NEGATIVE (-)
TERMINALS OF THE AMPLIFIER IN THIS MODE CAN CAUSE SERIOUS DAMAGE!
You can still connect two loudspeakers using the lower positive (+) amplifier output terminals. This is
explained in the bi-wiring section following.
Now turn the ACS switch fully counter-clockwise so that it is in the XLR Balanced Mono position. It is
now safe to switch on your amplifier.
TERMINATION QUALITY
Quality of the connections must be examined to ensure that high performance trouble free operation is
enjoyed. Check that the connections are tight but do not over tighten. If bare wires are used make sure
that no loose strands of wire short cross the other terminals or the amplifier chassis. When using plugs
such as bananas, be sure to use good quality plugs with a firm fit.
BI-WIRING
Bi-wiring uses two pairs of loudspeaker cables for each channel loudspeaker. You will notice that the rear
panel of your Plinius SA-250 has two pairs of output terminals for this purpose. When using bi-wires in a
STEREO installation, connect each wire pair to a corresponding pair of binding posts (one cable to the top
pair, one cable to the bottom) paying special attention to positive (+) red and negative (-) black polarity.
With a MONO setup remember that your speaker wires must use the red positive (+) output posts ONLY.
Connect one speaker cable to the top positive (+) red binding posts, and the other speaker cable to the
lower positive (+) red binding posts.