Madrigal Imaging Mark Levinson No. 29 ユーザーズマニュアル

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:

Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
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.

PUSH

2 1

3

Figure 3: Female input

connector

+

–

–

+

–

+

+

–

From preamplifier main output

PUSH

PUSH

Right

channel

Left
channel

Figure 4: Connections for

single-ended inverting

operation