The QM4 is a "4-in, 4-out" matrix mixer amplifier. Its core function is to accept audio signals from various sources (microphones, music players) and route them to different speaker zones with individual volume and tone control. It is typically housed in a standard 1U rack-mountable chassis.
If your physical QM4 has different buttons, display, or features (e.g., no FM, no TWS), please modify the sections above accordingly. For a specific brand’s exact manual, look for a QR code on the product box or search “Audio Choice QM4 official manual PDF.” audio choice qm4 manual