That is not my experience with the QMX/QMX+ audio.
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When I use a reasonable quality earphone (I have some very old Apple iPhone earbuds with the 3.5mm plug), or when I use my Heil headset, the quality of the audio from my QMX audio jack is excellent.? Surprisingly so.? It is quiet and clear, with no discernible distortion, SSB or CW or digital modes.? Even a cheap pair of earphones I bought before boarding an airline flight produce very nice audio.? I would say it is exceptionally good, considering the low cost of this kit.??
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When I hook up a cheap powered external speaker, the audio is good, but not nearly as good, and easily distorts at higher volumes.? I understand from others that they have external powered speakers that work very well.
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The QMX audio output is designed for earphones/headphones.? Measuring it via an audacity recording may not give it a fair representation, since the audio input to most computers is designed for a high-impedance microphone, and may not present the expected load impedance.? Having said that, I will also say that I have measured my QMX audio via audacity recording, after carefully setting the levels (QMX volume setting and computer input setting), and it does not look distorted like what you show, so there may indeed be some fault with that particular QMX+, or with the recording setup details.
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But the bottom line is that my experience with both my QMX and QMX+ is that they produce excellent audio, and that your message title of "severe QMX+ audio distortion" is certainly not what you can expect from this design.
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Stan KC7XE
