Electrostatic discharge (ESD) from dry carpets can freeze the QM4. The stock manual says to "unplug the unit." A better manual gives the hard reset procedure:
This is not in the original documentation. audio choice qm4 manual better
To make your QM2 (or QM4) perform optimally, ignore the manual’s “default” suggestions and do this instead: Electrostatic discharge (ESD) from dry carpets can freeze
| Setting | Manual’s Advice | Better Setting | |--------|----------------|----------------| | Crossover for sub out | 120Hz | 80Hz (if using satellite speakers) | | Bluetooth codec | Auto | Force aptX (Android/PC) or AAC (iOS) | | Display brightness | Medium | Low (reduces internal PSU noise) | | Line out mode | Variable | Fixed (if using external preamp) | This is not in the original documentation
Since you are researching a better manual, you might also be asking if the QM4 itself is the right choice. Briefly:
Verdict: The Audio Choice QM4 is a better piece of hardware, but only if you use a better manual—like this guide—to unlock its potential.
Print this section and tape it to your QM4 rack.
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