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https://www.diyaudio.com/forums/pass-lab...
“The common (ground) connection is attached to the red speaker posts. The actual output of the amplifier is connected to the black posts. Because this amplifier circuit is inverting in absolute phase, if you connect your speakers to the amplifier red to red and black to black, absolute phase will be restored.You are not the only one slightly confused by this, so it's totally worth explaining again. “