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Alternator whine coming from speakers

  • 2003
  • Boxster S
Mileage: 
74 500
Electrical and Electronic
Candler, 
North Carolina

I recently installed a double din Pioneer touchscreen head unit to replace the CDR23 stock single din HU. I installed a MOST coverter to retain use of the Bose Amplifier and existing speaker wiring / speakers, etc.  The stock Porsche power wiring was retained using a METRA conversion cable (4 leads) from Crutchfield, so there was no need to tap into the car's electrical system.

The head unit works as designed and the sound quality from the Bose amplifier and speakers (while sitting stationary) is excellent . . . BUT, driving with the HU off, I get a very noticable high-pitched whine that rises and falls with the engine RPM, and seems to be emitted by the speakers, particularly by the sub-woofer behind the driver & passenger seats. 

It has been suggested that I need to install a ground loop isolator, which I think is a capacitive component of some kind.  If so, what should I buy and where should it be installed?

Thanks!

Peter

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