help me decide on a set up

[99grandprixGT 5,000+ posts]

alright im looking for some new sub/subs and an amp. im look for spl more than sq.my budget is 600 for just the subs and amp. im either going to build the box or have someone local build it and i already have knukoncepts wires ran through the car already. the only problem is the box can be no bigger than 4.0 cubes after subs and port displacement or it will not fit in my trunk. im been thinking type Rs but id rather try something from FI like the 15 BL mabye one thoose. im bascially looking to see what i can get the loudest with for 600 dollars i know its not allot but i think i can do pertty good with this. the system needs to be louder than two Kicker CVR 12s that i have now. for the amp it looks like hifonics for the budget amp. thanks allot.

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[miker 5,000+ posts]

I say get a 15" with the amount of space you have.

 

[Buck 5,000+ posts]

I say get a 15" with the amount of space you have.

get a 15" btl if possible

 

[99grandprixGT 5,000+ posts]

get a 15" btl if possible

ya i want a btl but than id need a bigger amp and some electrical to support it. If i go with the BL i can always add another one down the road if i am not happy with the out put.