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The XLR input pin configuration used in all Plinius products is as follows:
PIN 1 to GND
PIN 2 to +Signal
PIN 3 to -Signal
NOTE:
Because of the way balanced XLR inputs are configured it is not possible to
connect both XLR and RCA at the same time.
AMPLIFIer CoNFIGUrATIoN SeLeCTor (ACS)
The Amplifier Configuration Selector (ACS) is a unique switching method that exploits
all of the operational features of your PLINIUS SA-103 Power Amplifier. By using this
switch it is possible to operate your amplifier with either balanced or unbalanced
signals and achieve a stereo or mono output.
The ACS switch options are:
RCA STEREO: This option provides a stereo output via both left and right output
channels from a stereo signal connected to both left and right input RCA inputs.
RCA BRIDGED MONO: This option configures your amplifier to drive one loudspeaker
from one unbalanced signal fed to the RIGHT RCA input.
XLR STEREO: This option provides a stereo output signal from a balanced stereo
input signal connected to both the left and right XLR inputs.
XLR BALANCED MONO: In this mode both channels of your PLINIUS SA-103 combine
to operate as a true balanced mono amplifier, from input to output. This configuration
provides the highest quality mono performance from a balanced line input connected
to the RIGHT BALANCED XLR INPUT.