Perreaux SM6 MKII - Manual (Page 11)

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Rear Panel Functions
Caution! Observe precautions regarding volume control settings. Please make all
changes at minimum volume setting. Only increase the volume after the
connections have been made.
Balanced Inputs
Accepts a signal from a source component with balanced outputs via high
quality XLR connectors. The use of good quality balanced line cable into the
balanced input cause the input signal to be relatively immune to noise and
external effects caused by the use of long interconnect cables, helps reduce hum
loop noise and aids in the cancellation of distortion products.
The pin assignments of the balanced XLR input connectors are as follows:
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Shield ground: Chassis ground
Note: Please refer to the operating manuals of your balanced output line level
source to verify that the pin assignments of the output connectors
correspond to the SM6 balanced inputs. In the event that they are not
compatible, the interconnecting cable will need to be altered to suit.
Balanced Input Switch
This switch selects which input to use for source input A. Set to ON if using the
balanced (XLR) inputs and OFF if using the unbalanced (RCA) inputs.
Note: Do not connect source equipment to both the balanced and unbalanced
inputs at any one time.