my budget is 400 bucks after whats better 2 15 cvr or cvx or is there sothmeing better please help or are the rockford better i was also think 4 12s what sounds harder?
$400? Save for about 500-600 and get 2 15" Type Rs and a AP15001d. One of the better budget setups you can find. OR get someone to suggest something that can do 1000-1200 watts and just get the 2 12" type rs. The older model 12s can be found for $150-$200 a pair easily.
If it were me, and I was looking to stay with one of the mass-market brands like kicker, alpine, etc, and I was looking for something that would get loud and still have some decent quality, I'd just go with 1 Kicker Solo Classic 15 (4 ohm version, wired to 2 ohms): Amazon.com: Kicker Solo Classic 09S15C4 15-Inch 4-Ohm Subwoofer:…. I'd put in a 1.25cu ft sealed box, and power it with an Alpine MRP-M1000, wired to 2 ohms:http://www.amazon.com/gp/product/B00142FJRC/ref=ord_cart_shr?ie=UTF8&m=A2LYDS8AIU9VMR. That puts you at about $435 shipped, for everything, if you buy from those sellers. JMO
Better question is what is your goal? Is your budget for amps/subs/box/install combined? What equipmetn do you allready own? Do you plan to upgrade your electrical system? Can you build a box yourself? How much space (in cubic feet) are you willing to sacrifice.