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All:

I have an old 12" Sunfire True Signature Subwoofer from 2002. Sunfire will not repair this because it is too old so I am looking to repair this myself if it is salvagable. I have a mysterious problem that I'm hoping someone on the forum will have experienced before that can help point me to the problem component. The problem is that I have an 80 hz harmonic at lower volume levels.

My example source is the initial track of Dark Side of the moon. The heart beat runs at 40-60 hz but I also get a big pop at 80 hz at every beat. The magnitude of the pop goes down as the input signal increases so it is pretty intermittent overall - but very annoying.

So any thoughts on whether the amp may be doing this or whether I have a driver gone bad?