Loose or corroded connections in the wiring will cause noise. I agree it's the least likely of all scenarios. But really, what have you got? An Amp, Speakers, Wire and a Source (mic, telephone system, music source etc.)

Anytime I can eliminate 25% of the potential problems, easily, I do it.

But then I'm lazy and old fashioned.

Sam


"Where are we going and why are we in this hand basket?"