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I grabbed a 6" speaker I had laying around and replaced the 10" subwoofer - I got the same crackling noises with no input attached which confirmed the amp was fried. I purchased and just installed a Dayton SA70 amp panel (with some small modifications to the Polk box). The Dayton unit works...

Thanks for the analysis. I will just replace it.

I did as you suggested. No crackling noise heard while moving any of the controls. No change after moving the controls. The volume of the crackling remains the same as I tap the speaker and increase/decrease the volume knob.

I have an old Polk PSW-110 subwoofer that has a lot of crackling. I replaced the wire from the receiver to the speaker - no difference. I unplugged the input from the receiver and when I tap on the speaker I hear the noise - even if the volume is set to minimum. Any idea on what the most...