Re: multi subs in ported chamber
keep it simple....double the box size and add another 3" port.
as for you power issue...caps are worthless...talk to anyone in high end car audio....sell them and get a high output alt. or get yours rebuilt. it's always best to fix the problem at the source....
2006 Jeep Liberty
Adire Audio 15" Brahma running off Cadence A7hc, Clarion hu, MB Quart 6.5s and 5.25s running off old school Punch 800a4
146+db @ 38hz with 1200w and a single 15"
Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
*Vb = vol. in cu"
**R = sq.rt. A / Pi (for square/slot port)