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Old 02-18-2013, 06:18 PM   #4
Scooby Newbie
Member#: 283194
Join Date: May 2011
Chapter/Region: RMIC
Location: Colorado
2017 STi and '05 WRX


Pioneer's normally show ground loop issues more than any other h/u's. A few things you can try are.
1) Better grounds. Amp, h/u, and factory subaru grounds.
2) Make sure rca's and speaker wire are complete opposite side as power.
3) ground your rca's to radio ground/ amp ground. (rap copper wire around all 4 rca's, then ground to amp on one end, h/u on other end.)

You are getting a "ground loop" because your dealing with different ground paths between a common system..
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