RonRizz

All that being said, To the OP I say this.... Take the car back to your installer, and have him properly adjust the adapter he tapped in between your Aftermarket HU and your Bose amp. Should take him about 10 seconds to dial it in to remove the hiss. (there are adjustment screws on the front of it for left and right) OR you can locate it yourself (he probably installed it behind your HU, and do your own adjusting.

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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