Agreed. Soundproofing is a must if your after SQ. Road noise aside, just killing resonations from various sources improves your sq, even if the car is sitting still. There's a reason why that stuff isn't cheap........And to the O.p, yes, change the HU.
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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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