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The NA4MP-M-X Polarity Inverter from Neutrik swaps the positive and negative wires for one loudspeaker wiring pair. This inverts the polarity of the speaker (making the speaker cone push OUT when it would otherwise pull IN, and vice versa).
Table of Contents
Side A's 1+ terminal is connected to side B's 1-
Side A's 1- terminal is connected to side B's 1+
The second 2+ and 2- terminals on both side A and side B are not connected at all