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Message: <blockquote data-quote="SRT8" data-source="post: 7734165" data-attributes="member: 639720">Hi, I have a Clarion CMD4 deck on my boat.  It used to have two speakers hooked up to a Clarion 4 ch amp, two speakers powered by the deck, and the other two amp channels going to a sub.  It sounded good.  I then bought a Polk Audio pdx2000.2, bridged it to power the sub, and kept the 4 speakers powered by the amp.  The amps are hooked up by 2 volt pre outs from the deck, the sub on the "non fadeable" one.  Amp and deck settings are all correct.Problem is, speakers sound good, but absolutely no output from the sub.  With gain maxxed, you can barely feel the sub vibrating by touch.  I hooked up this amp in my vehicle to test it, with the same amp settings, and it pounds!!  I checked, and the amp is getting 12v power in on the boat. So what the heck is going on here, I'm at a total loss?!</blockquote>

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