It sounds like you are checking everything you need to. Just a suggestion, take a step back, a deep breath, and go through all of the simple (as in operator error) type issues first. All settings in HU proper....check settings on amp..... Try disconnecting bass remote for any discernable difference.... ect ect ect.
Next comes your wiring. Methodically go over it from front to back. are all your RCAs correctly connected (channels 1,2, 3, and 4 match from HU to amp, ect. If all is well, see if you can get your hands on another amp (from a friend) and hook it up, see if it makes a difference.
Its hard to troubleshoot without being hands-on. I say give it another go, and if no good, take Big up on his offer, and save yourself some heartache.
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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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