Single-Ended Inverting Operation; Figure 3: Female Input Connector - Madrigal Audio MARK LEVINSON 29 Operating Manual

Single-ended inverting
operation
Figure 3: Female input
connector
Figure 4: Connections for
single-ended inverting
operation
4
Inverting operation should be used if a phase reversal is required. In
this mode of operation, the output signal of the amplifier will be 180°
out of phase with the input signal. This may be required if one
component in the system inverts the signal and absolute phase at the
loudspeaker is desired.
For inverting operation, the main output cables of the preamplifier
must be connected to the XLR-type inputs on the rear panel of the
Nº29. The pin assignments of these connectors are:
PUSH
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
2 1
Pin 3: Signal – (inverting)
3
Connector ground lug: chassis ground
Connect the XLR-type male line-mount connector to the preamplifier
main output cable so that signal "hot" (+) connects to Pin 3 and signal
ground connects to Pin 1. Be sure to also connect Pin 2 to Pin 1 inside
the XLR-type male line-mount connector with a piece of copper buss
wire (or similar material) at the amplifier end of the cable.
Note: If you prefer not to connect Pin 2 to Pin 1 inside the XLR-
type male line-mount connector, pre-shorted RCA-type input
connectors are available from your Mark Levinson dealer. Insert
one of these connectors into each of the RCA-type inputs (non-
inverting) on the rear panel of the Nº29.
After completing the cables, connect the main outputs of the
preamplifier to the left- and right-channel XLR-type inputs on the rear
panel of the Nº29. Be sure to remove the shorting strap between Pins 1
and 3 before inserting the output cable connectors.
+ –
Right
Loudspeaker
channel
Nº29
+ – – +
PUSH PUSH
Right
From preamplifier main output
– +
Left
Loudspeaker
Left
channel