[TenTec] early morning questions

[Dr. Gerald N. Johnson, electrical engineer]

While the narrow response of the ancient headphones might help in
filtering some noise, it probably contributes ringing to the signal in a
matter that the wide band phones wouldn't. A good low pass filter might
be a better solution for the audio line. I've created a passive filter
with switchable cut off frequencies that works in 4 or 8 ohm lines that
takes out audio hiss quite nicely. I've not detected it introducing any
ringing when used in my speaker lines.

73, Jerry, K0CQ

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