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Funky feedback definition
Authored by: WillyT on Oct 23, '02 07:55:17PM

Audio professionals usually define audio feedback as output signal getting back to the input signal and causing a runaway regenerative output ie. a howling higher pitched unpleasant tone.
What is being described here seems to be either a ground loop where some of the signal contains a difference in potential of the mains ground (earth) or rf leakage that gets rectified in the next input stage causing a dc offset.
If the hum seems to be mostly odd harmonics of 60Hz then it probably is a ground (earth) loop. If the hum is mostly even harmonics of 60Hz this would be from dc offset pulling the power supply down in the external audio device.
I admit that these could be described as feedback from a purely electronic perspective but should better be described as rf interference or ground loop.

As I have an older G4 I have not heard what is happening myself.

If this is actually rf a ferite bead on each signal line would be a more proper solution.(Less signal frequency degradation)
HTH

Willy



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