Im guessing its an input voltage issue. It almost makes no sense to try to hookup a preamp eq to control strictly the few octaves your subwoofer is using. Your amp should be all the control you need.
How many bands on the pre-amp relate to your subs freq. range? the ends will probably not justify the means in this case..... Just another source for issues to arise, noise, clipping, distortion, ect, ect.
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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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