Question about Alpine PDX-4.100 Car Audio Amplifier

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Channel 2 crackles

My front right tweeter crackles every few seconds or so. i thought i had a blown tweeter so i changed it out and the new one does the same thing. i then reversed channels 1 and 2 on the amp and the left front tweeter started crackling. looks like whatever speaker i have hooked up to the 2nd channel crackles. my amp is only 2 weeks old. could i have a channel out already?

Alpine PDX 4.100

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  • Anonymous Mar 02, 2009

    Same problem...Alpine said it was a bad amplifier. I replaced the amp and the channel 2 problem is more or less gone...but now I have a hiss on every channel, low, but present none-the-less. I am about to try a third amplifier and then switch to another company because Alpine keeps saying it is a problem with the amplifier. I bought from, BestBuy, and now Crutchfiel.

  • Shylight May 01, 2009

    Same problem as patrick2009 described.
    Even with RCA's disconnected the hissing sound is still there (in the right tweeter).
    The problem is really in the amplifier.



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Hiss sound is gain matching issue between source and amplifier. Channel crackel has show up on alot of the PDX amplifiers..... Not sure of the fix yet

Posted on Aug 25, 2009

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Make sure your speaker wiring does not come close to the 12v power cable running for your amplifier. If your amplifier's 12v power cable runs on the drivers side of the vehicle, run your speaker cables on the passengers side and make sure your tweeters have a high pass filter to stop any pickup of engine sound (When you are driving you *WILL* notice it at high RPM. a HPF (High Pass Filter) will also stop those nasty hissing sounds on S's.

Posted on Feb 11, 2009


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