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    Help with strange amp install problem

    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?!







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    Re: Help with strange amp install problem

    Bad RCA or the setting on the deck are messed up some how




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    Re: Help with strange amp install problem

    is the sub a dual voice coil? if you were powering the coils in stereo before, and now you've combined them at the amp, you need to ensure that polarity is not switched. that is the first thing i would check.



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    Re: Help with strange amp install problem

    No, svc alpine marine 10". I swapped rcas, even input signal with the front rcas vs the sub rcas to eliminate all those problems, still no output. Anything else?




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    Re: Help with strange amp install problem

    Someone suggested to me that when I took a V reading of 12V with the engine off, and it was putting next to no sound out, the amp is rated at 500W at 14.4V, and maybe that's why it was putting nothing out. Can anyone comment on that?




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    Re: Help with strange amp install problem

    no it should still be fine at 12 volts.has to be something going on with the deck or amp.possibly bad ground,but the amp should be grounded at the battery




    pioneer avhx 5500 dvd, gzpa 1.4000 x 2
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    Re: Help with strange amp install problem

    It's grounded right to the battery now. The amp worked in my vehicle when i installed it to test, and the other amp worked off the same set of pre outs, so its a real mystery!




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    Re: Help with strange amp install problem

    what is the ohm configuration of the sub on the boat and the sub in you car?



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    Re: Help with strange amp install problem

    Both are SVC 4 ohm. In car it's a Kicker Comp 10, in the boat it's an Alpine SWR-M100 4 ohm. I tried the Kicker sub off the boat amp with the same result, just barely vibrating.




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    Re: Help with strange amp install problem

    It works!! I re did the sub amp ground, turned the gain all the way down on the speaker amp, turned up the deck, set the sub gain, re-set the speaker amp gain. Now she pounds pretty good.
    I think it was the amp ground that was the biggest problem.




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