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my experience is that these noise pickup problems are not failures perse, but a design issue related to proximity of analog to digital circuits or inadeguate filtering or shielding etc
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Agreed, and the BFD is a very inexpensive device that doesn't enjoy circuits with creative pathways for noise immunity, but it does a very passable job in this low frequency application. The noise floor also isn't anything to write home about, but subwoofers aren't victims of the bandwidths involved.
Evidenced by the thousands of satisfied users of the BFD who have not witnessed any low frequency noise from their systems, I think it's safe to say you have a faulty unit or you have it in the feedback destroy mode......
brucek