: Confirm the speaker is powered on and check for a faint "hiss" when close to the grille. If silence persists, test the signal chain by connecting the source directly to the master output if possible.
The QM4 has four audio inputs (Input A, B, C, D). The original manual assumes you will use one source per input. A better manual explains the priority routing. audio choice qm4 manual better
Often bundled with two 10" enclosures featuring horn tweeters. Dimensions (Mixer) Approximately 6" H x 18.5" W x 11.5" D. Operating Instructions : Confirm the speaker is powered on and