More info would be helpful. I highly doubt that its a ground issue, however. Are you saying that it is hissing when the unit is powered off, or just when the audio from the Nav is muted?
It sounds to me like a Source Level Adjustment issue.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
Last edited by RonRizz; 12-10-2013 at 01:45 PM.
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