4th attempt i used 4 12" soundstream dual 2ohms subs running all 4 to 1ohm, i used a u.s technologie amp 750rms at 1ohm plus aeropro 2 farad cap and still running the standard batterie this time i achieved 143.4db.
5th attempt i used 2 15" u.s audio dual 4ohms running each sub at 2 ohms, i used 2 u.s technologie amps running 550rms at 2ohms each and using the same cap i achieved 141.8db.
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