I see, you should have used the OEM wiring. There was no need to run new wires to the underseats. The reason you are missing frequencies is because the Earthquakes don't reproduce them very well. The Kickers will be better at playing mid-bass. Otherwise, I think you are on the right track now.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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