Re: 2 12's vs 2 15's
the real question is how much space do you have to sacrifice? how good subs sound is not based on their size, is a full blown myth dont ever spread that around @_@. How good a subwoofer sounds is dependent on the enclosure you put it in. if your 2 15s only get 2 cubic feet each, then its going to sound like crap compared to 2 12s with 2 cubic feet each. The design of the box also plays a big role too. Everything from sanding down the edges, making 45 degree angles in corners to bracing to proper baffling to port size and tuning. All those factors along with adequate power and electricals with proper EQ will determine how efficient and how good your system actually sounds.
To end this off, go big or go home if you have the space for it. 2 15s is going to need 3.5(minimum) - to 4.5 cubic feet of airspace to breath and thats a NET number that means thats the space left after subtracting the thickness of the wood, bracing, port area and sub displacement.
Clip city b1tch, clip clip city b1tch. 10's, 12's, 15's, goin up in flames b1tch.
09 Sienna Subs : DC level 5 18s d2. Sub amp: banda viking 7k
Headunit: Pioneer 80PRS bought used from vertex audio Mids/Highs amp: PPI Phantom 900.4 - bought from dragnix
Front stage: 3 way active front stage with Massive Audio CKX tweets, alpine type R 6x9 midbass in doors + DB drive pro audio 6.5 in the kick.
320 amp Singer alt. 0 gauge Audio technix ofc all around, 2 group 31 agms in the back 250 amp hours total.