[Kenwood] How to reduce the TS850 "hiss"?

[Dr. Gerald N. Johnson, electrical engineer]

I cured HF audio noise by adding a speaker line passive low pass filter.
I have a couple circuits published locally. Switched cutoff frequencies
from about 450 Hz up. Cleans the HF noise from any receiver far better
than an external DSP because the DSP audio output stage contributes
noise.

73, Jerry, K0CQ

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