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      09-01-2008, 10:21 AM   #5
scooby9
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Drives: 2007 E90 BMW 335xi
Join Date: Jul 2007
Location: Calgary, Alberta, Canada

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The strange thing is that it wasn't a problem before but it is now. It could be that the amp is defective now...

Do you know anyone with a spare aftermarket amp that you can swap in to test if the hiss is still there? If it is, then it is a wiring or source unit problem. If not, it's probably the amp. The PDX series are still D-Class amps which are generally noisier.
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