I agree with Stan on this. All of my QCXs and QMXs have great audio. It's possible to make them distort with maladjusted AGC, but if you set it right, or turn it off, the audio is great. The QCXs benefit from a 1K ohm resistor on the wiper to make them a bit more linear, but the QMXs digital volume works great.?
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73, Dan - W2DLC
Daniel Conklin