John some pioneer HU have some ground issue so the above method is used to get rid of the whine....it has been posted here by s0uljah http://www.team-bhp.com/forum/413720-post5726.html (Car Audio Advice from the Audio Gurus: Use "Search thread" before posting a new Q!)
It is a normal thing to do...
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156.6 db, naa....time is coming to cross it......
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