Please HELP: Noise Floor - Audible Hiss - Jeep Garage - Jeep Forum

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Old 08-19-2016, 12:00 PM
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Please HELP: Noise Floor - Audible Hiss

So here is my setup:

Stock HU - Factory AMP - Fix 86 - Alpine Amp - Front Speakers (using crossovers) & Sub.

Problem: Even with the gain at 0 and the HU muted, I get a hissing noise coming out the the speakers. I'm using the best RCA cables, all high end equipment. I can't change the factory HU because its the 8.4 and controls other systems in the car.

If i hook up the morels directory to the factory amp, there is no hiss, its only when I run it thru the amp. I've used 2 different amps, both Alpine - PDR-V75 and the Alpine MRV-500.

Don't know what to do. Its not a grounding issue, this is with the engine off, there is a loud hiss and if I turn up the gain it gets worse. My fear is that there is nothing i can do here and its the stock HU.

Any ideas?

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  #2  
Old 08-21-2016, 10:59 AM
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Re: Please HELP: Noise Floor - Audible Hiss

I am assuming you don't have the upgraded Alpine or HK audio? Otherwise I was wondering if you are able to connect the Fix 86 back to the stock amp to see if it's the Fix 86 producing the hiss/grounding issue. Or if you are able to connect the HU straight to your aftermarket Alpine amp to diagnose the same. I'd say it's one of those two equipment since you obviously didn't have the problem prior to the upgrade.
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Old 01-04-2017, 01:46 PM
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Re: Please HELP: Noise Floor - Audible Hiss

Did you ever figure this out?
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