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  1. Subwoofer Amps | High Pass Filters
    I just picked up a used QSC PL 9.0 PFC and was wondering if there is a fan mod for this beast. I know it uses 4 fans and it is easily audible at the LP so I was hoping I could quite it up a bit. I will be using it to drive a pair of LMS Ultra 18" each in there own 4 cuft enclosures. Thanks in...
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