hiss may be due to mis-matched output level of head unit to input of amp.
check your settings on your converter. radio reception issue......did you connect 12 volt switched to your antenna adapter??
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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
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