To get a balanced, professional sound output in small rooms, churches, or rehearsal spaces, use this basic gain-staging technique:
Drives passive PA speakers directly without requiring an external amp. Step-by-Step Setup Guide
Audio Choice QM4 (often listed as the AudioChoice by SoundTech QM4
The (by SoundTech) is a vintage 4-channel 100W powered PA mixer frequently used for karaoke, small live performances, and mobile sound setups. Manual and Documentation audio choice qm4 manual link
Because Audio Choice amplifiers are often considered "vintage" or "discontinued boutique" gear, several classic car audio archives hold the file.
Understanding the fundamental constraints and capabilities of the QM4 ensures you do not overload your system or damage your connected speakers. 100 Watts RMS Channels: 4 independent input channels
Due to the product's age and discontinuation, a single, official manufacturer's manual is not publicly available online. However, the information needed to operate the QM4 can be pieced together from sources that cover identical or very similar hardware. To get a balanced, professional sound output in
If the "CLIP" light flashes constantly, reduce the input volume to prevent distortion. 🔗 Manual Link and Documentation
Given that Audio Choice is no longer an active brand, the original PDF may disappear from hosting sites. Here is your backup plan:
Check the batteries; the remote requires a direct line of sight. If the "CLIP" light flashes constantly, reduce the
: Start with the channel gains at zero. Plug in your microphone or instrument and slowly raise the gain until you reach a clear signal without the "clip" light activating.
: Provides digital versions for similar era equipment and often lists the Q M4 Soundbar manual (note: ensure you are searching for the "Audio Choice" PA system and not the Q Acoustics M4 soundbar).
I can provide specific wiring diagrams and step-by-step gain staging instructions based on your gear. Share public link