For the full operation instructions, including frequency pairing for UHF microphones and media player navigation, you can access the AVSL QXPA Portable PA Units Manual (178.856UK/178.853UK)

Inputs for microphones (XLR/6.3mm Jack) and aux devices (3.5mm), along with Bluetooth. Media Player:

Ensure your speaker load matches the QM4’s requirements (usually 4 to 8 ohms). Overloading can cause the thermal protection to kick in. Use Balanced Cables:

: High, Mid, and Low frequency adjustments for the overall mix. Connectivity : Includes an Footswitch jack for remote reverb control. Speaker Compatibility

: If you need general operating logic (e.g., phantom power, EQ settings), this Professional 4-Channel Mixer User Manual provides nearly identical layout instructions.

has long been a cult favorite in the pro-audio world for exactly this reason. It isn’t just a piece of equipment; it’s a reliable workhorse designed for the road. Why the QM4 Stands Out

The system is built for durability and ease of use on the road. Specification Details Input Channels 4 Channels with combination 1/4" and XLR inputs Channel Controls Individual Gain, Tone, and Reverb controls per channel Master Section 3-Band Graphic EQ, Master Reverb, and Master Level controls Connectivity EFX Loop (Effects Loop), Line Out, and Footswitch jack Standard Setup