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  1. Subwoofer Amps | High Pass Filters
    Hi, I own two Kef PSW4000 subwoofers (12" woofer, 500W amp, bass reflex, amp cutout dimensions are: 16.5" w x 10") and with one of them I have been having a lot of problems. There's an intermittent hum that either doesn't show up for days or sometimes it happens within minutes. The sub has been...
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