Inverting operation should be used if a phase reversal is required. In this mode, 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 Nº23.5. The pin assignments of these connectors are:
Figure 3: Female input connector
PUSH
23 1
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 your preamplifier's 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 XLRtype male line-mount connector, you may purchase preshorted RCA-type inputs from your Mark Levinson dealer. Insert a pre-shorted RCA-type connector into each RCA-type input (non-inverting) on the rear panel of the Nº23.5. After completing the cables, connect the main outputs of your preamplifier to the left- and right-channel XLR-type inputs on the rear panel of the Nº23.5. Be sure to remove the shorting strap between Pins 1 and 3 before inserting the output cable connectors.
From preamplifier main output
Right Loudspeaker
Right channel
Left channel
Left Loudspeaker
Figure 4: Connections for single-ended inverting operation
