Audio Choice Qm4 Manual Link 2021 Jun 2026

You have reversed the speaker wires. For bridging, connect the speaker’s positive wire to CH3 (+) and the negative wire to CH4 (-) . Do not use CH3 (-) or CH4 (+). The QM4 uses a differential bridged output.

For power supply/converter manuals, refer to the TDK Product Center . Device Features & Specs audio choice qm4 manual link