PSB HD8 Subwoofers Pair - RRP $1699 each

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I bought a PSB 3.2 system earlier this year mainly just for these subwoofers which I've owned in the past and have a high opinion of. Unfortunately both have a low level noise that I'm almost sure is capacitors that need replacing (not a grounding issue). They seem to play fine but when dead silent (no music, connected or disconnected from a source) the "noise" is apparent.