stuff list;
16mm mdf construction
2x sony xplod 12" subwoofers ( u h8tin? )
pioneer GM-D8601, subs wired para, 2ohm so 500w+
various box calculators, mainly winISD
box was designed for my audi A4 1.8T quattro (b6, 2002) and fits great in that boot(trunk).. not so much in this hyundai excel (amp was already in this car, still need to wire up the audi.)
interesting response curve on this, at higher notes it's not unlike a single 12, however the lower you go (towards 25hz) the louder it gets, so very low notes are rather extreme, but the top end is smooth. might require another sub for mid bass in this case, though it's just sitting on a seat, once mounted securely it should improve the response.
anywho, goes to show how much boxes can affect subwoofers, the single sealed xplod that normally bumps this car could never hit low notes even remotely this good.