Madrigal Imaging Dual Monaural Power Amplifier, Mark Levinson No. 29 manual Female input connector

Single-ended inverting operation

Figure 3: Female input connector

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

Figure 4: Connections for single-ended inverting operation

+–

Right Loudspeaker

	Nº29
+ –	– +
PUSH	PUSH
Right	Left
channel	channel

– +

Left Loudspeaker

From preamplifier main output

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