Audio Note M8 Line Owner's Information page 9

Balanced The M8 preamplifier is equipped with two pairs of XLR / Balanced
output sockets. These are connected to custom designed and
manufactured output transformers, which use an improved output and
grounding scheme to provide the best possible connection to the
power amplifier.
Below is a description of the various cable and connection options: -
RCA
OUTPUT
SOCKET
BALANCED /
SINGLE ENDED
SWITCH
The pin configuration for all Audio Note (UK)
XLR / BALANCED connections is as follows: -
PIN 1
PIN 2
PIN 3
The
simultaneously; select the appropriate output using the toggle switch.
When using an amplifier with a true balanced input, the
'BALANCED / SINGLE ENDED' switch may be set in either position.
When set to the 'BALANCED' position, the centre tap of the output
transformer secondary is connected to the preamplifier's ground.
When set in the 'SINGLE ENDED' (unbalanced) position, the
secondary 'floats' in relation to the preamplifier ground. This provides
the option of either a low or high common mode impedance to ground
at the preamplifier output. Experiment with both positions to achieve
the lowest background hum from the system.
CONNECTION continued...
Ground / Shield
Positive / Send
Negative / Return
balanced and unbalanced
XLR MALE
OUTPUT
2
1
3
outputs cannot be used