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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Coding base radio to HiFi

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      03-25-2012, 05:39 PM   #1

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Coding base radio to HiFi

I have a base system with iDrive running a technic harness, ms-8 and alpine PDC-5 amp. I get a small hiss when the car is running or not, when I press the brake pedal it's gets louder. I thinks it's a ground problem somewhere. My question is if I code the radio to Hifi and use the RCA connections is there a chance the problem might be solved. Will the signal from the radio be cleaner? Or should I just worry about finding the grounding problem?
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      03-25-2012, 07:26 PM   #2
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Post pictures of your grounds

Post pictures of your grounds.
Also post pictures of your amplifier wiring.
Measure your grounds for low resistance .
Lots of other people have a similar setup, They will probably chime in sooner or
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      03-25-2012, 08:43 PM   #3
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Its probably a ground problem. Ground to the battery, or where the battery is grounded to the car if possible.
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      03-25-2012, 09:53 PM   #4
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You mean PDX-5, don't you?

I think it's the amp. Hiss problems with that generation of PDX amps were a common complaint, and the PDX-5 is an older design. It's been complained about before.

How low are your amp input gains?
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