most spl least amount of money

i have 2 kicker cvx 12's in a box which is 5 cubic feet and im wanting something that hits harder what is the best round 12's for spl i can get???

the amp is rated at 1400 watts rms at 2 ohms i have it running 1 ohm it has 4 40amp fuses, if i change to a 240 amp altenator do you think i will get more watts out of the amp or no im thinking about keeping this amp and gettin some subs that are something like 1500 watts rms each using this amp to power one and gettin another one that is similar power for the other 12 any advice,

also will those digital designs 6.5's work in a qlogic kickpanel for a mustang or is that enough cubic feet for them??

Typically Q-logic kick pannels can only fit 5 1/4 and smaller component sets.  What brand amp are you running and what is the model number of the amp?  Also what is the model number of the crv's?

Well if you dont want to spend alot of money you could go with something like the Audiobahn Flame Q's 1208T ($249) but you would need that second amp and you would probably lose SQ. Another option would be the Soundstream T-5 ($199). I have heard good things about its power and sound clarity but couldnt exactly tell you how it would stack up against the CVX. MA Audio does a good job on SPL with their HK12X2 ($229) but again you would need another amp. Or you could take this approach and buy 1 Pioneer Premier TS-W5102 ($649) and be dropping extremely high SPL levels.

(online prices)