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Subwoofers are just like any other amplified speaker in that you have a speaker and a power source.
The amp module can fail, which can be manifested as a ground buzzing, a “whump whump whump” noise that sounds like a helicopter landing (scariest at 2am), or just no output what-so-ever.
The speakers can blow, which sounds like a buzzing or rattling.
We service many brands of subwoofer, including: B&W, Velodyne, JBL, Mackie, Klipsch, Mirage and more.