this doesn't make sense to me. Obviously it is a signal input issue, if you input your phone and it played ok, that rules out voltage issues, as well as incorrect input settings at amplifier (possibly) and speaker out connections. the absolute only other thing it can be is that it is not getting a signal through the rcas. did you check the voltage to see if signal was present??
Next question.. was this hooked up and working, and just died, or a new install.
next question... Did you try a DIFFERENT set of rcas from HU to amp?
next question.. Is amplifier gain turned completely down
It sounds like you have done the majority of the troubleshooting necessary. Next step is to remove all pieces from car and do bench testing.
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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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