The QM4 uses internal heatsinks. To ensure it lasts longer: Keep 1U of empty space above and below the unit in a rack. Use a canned air duster to clear dust from the side vents.
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Skip the printed manual’s troubleshooting section. Instead, use the digital PDF (available on Audio Choice’s support page) and search for keywords like “gain staging” or “EQ lock.” For daily use, create a one-page cheat sheet: The QM4 uses internal heatsinks