The master section features a global 3-band graphic equalizer. Instead of boosting the high frequencies to get "crispness" (which easily causes piercing feedback microphone loops), use the EQ to adapt to the room. Slightly reduce the Low slider.

To ensure the QM4 performs better than the day you bought it, you should check the official manual for three specific calibration steps:

The QM4’s default sound is bass-heavy. Fix it:

Plug in microphones via XLR or instruments via 1/4" jacks into any of the 4 input channels. Level Adjustment Channel Controls

: The manual is absolutely necessary here to prevent you from blowing up the internal amplifier. It will state the minimum OHM load (usually 4 or 8 ohms) allowed when connecting speakers in parallel. EQ and Effects Routing

However, the secret to achieving superior sound quality and longevity from this analog unit isn't just in the hardware—it's in understanding its operational nuances. Reading the Audio Choice QM4 Go to product viewer dialog for this item.

: Manual tuning relies on your ears and basic tools, avoiding the hardware-software handshake issues common with calibration microphones and apps.

controls fully counter-clockwise (to minimum) before powering on. Connections

: Ensure the mixer's vents are not covered to prevent overheating. Power Down : Always set the Master Level

: Ensure at least 50mm of spacing around the unit’s vents to prevent overheating during high-load performance.