Audio Choice Qm4 Manual May 2026

The Audio Choice by Sound Tech QM4 is a 100-watt, 4-channel powered mixer head designed for small PA systems, featuring XLR/1/4" inputs, individual channel EQ, and onboard reverb. Operated by connecting passive speakers to the rear output and balancing channel levels with the master volume, this legacy unit is frequently found on reselling platforms. For a detailed listing with specs, visit Reverb.

4. Troubleshooting Common Issues

| Problem | Possible Cause | Solution | | :--- | :--- | :--- | | No Sound | Input not selected. | Check if there is a switch selecting "RCA" vs "XLR" on the back. | | No Sound | Volume too low. | Check both the source volume (phone/PC) AND the amp volume knob. | | Red Clip LED | Overloading. | Turn down the amp volume. If the source device is at 100% volume, it may be distorting the input signal. Lower the source volume and raise the amp volume. | | Protect Mode / Cuts Out | Speaker wire short. | Check rear connections. If positive and negative wires touch, the amp will shut down to protect itself. | | Humming Noise | Ground loop. | Ensure audio cables are not running parallel to power cables. Try a different audio source. |

Connect the XLR output of the QM4 to your amplifier, powered speaker, or recording interface. audio choice qm4 manual

: Ensure your speakers match the 4-ohm impedance requirement of the amplifier to avoid damage to the power stage.

Part 5: Troubleshooting Common QM4 Issues (From the Manual)

The Audio Choice QM4 Manual dedicates several pages to error resolution. Below are the most common problems and their official fixes. The Audio Choice by Sound Tech QM4 is