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General speaker questions for audio and home theater.

RE: " better EMI/RFI rejection " is it really an issue for speaker cables ?

Hi Rick,

I'm having a little trouble wrapping my head around this:

It has little to do with gain, a lot to do with effective aperture: Speaker wires and power lines are great antennas! The junctions in your output bugs are rather directly connected to the speaker wires, especially if the design doesn't use a Zobel network, and your amplifier becomes an amplified crystal set.


For a typical solid state amplifier with low output impedance, and a similarly low impedance speaker cable, I presume the output stage should effectively become a sink for any induced noise currents at frequencies within the bandwidth of the output stage, just as it is a sink for back-EMF. In other words, it is close enough to an ideal voltage source within its bandwidth that the speaker only sees the noise induced voltage differential across the cable.

Assuming a typical push-pull output stage, I don't see how it could behave like a crystal set because one side or the other is always conducting so there would be no rectification.

I hadn't given much thought to noise frequencies outside of the bandwidth of the output stage, but wouldn't they just be shunted through stray capacitance?


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