Help! Rockford sub setup and box design

[96Blazer]

Im looking at building my new system but need some input on which subs should choose. Im thinking either 4 rockford p2 12's dual 4 ohm, or 4 rockford p2 15's in dual 4 ohm. Im just not sure if ill have enough space for a ported box for the 4 15's. The subs will be going in a 1996 4dr blazer and I would like the rear seats to be able to stay folded up and not be stuck down. I will go with the 15's i guess if i can fit a good ported box for them in the truck without said seats needing to be folded down and without it sticking much over the window line. Thanks for any help on this! oh and btw once i get the whole project rolling a build thread will be made.

[Rickdod3]

What are the measurements for the back of your truck, find out the maximum size your box could be with the seats still up like you said, then you can figure out the volume of the box and whether or not the subs will have enough air flow...Im not to sure about the 15"s but im almost positive that the 12's would work out. So yeah figure out how much room you are working with and let us know good sir. =]

[splzx3]

we need how big we can make the box

[96Blazer]

ok im going outside right now to get the measurements

[96Blazer]

alright looking from the back window forward. I have a measurement of 46" at the back seat measuring across behind them. Then 30" measuring from the back of the rear seats to the rear tailgate. In the back in front of the tailgate i got 49" and finally a depth of 16". hope you guys can understand that. id like to keep the dimensions a little smaller then that aswell just so I know it will fit and to make it easier to take out it need be. thanks

[Rickdod3]

Are your back seats at a angle?

[96Blazer]

^^^ Oh damn yes they are! didnt move my current box out of the way to measure. didnt think of it. but now come to think of it if I can leave space there, my amps would have a nice spot to sit. How many cubes do I need for the 4 15 inch fosgate p2's ported?....roughly 10.64? on a quick calculation. Then the p2 12's ported would need? hmm.....7.2 cubes?

[Guest]

^^^ Oh damn yes they are! didnt move my current box out of the way to measure. didnt think of it. but now come to think of it if I can leave space there, my amps would have a nice spot to sit. How many cubes do I need for the 4 15 inch fosgate p2's ported?....roughly 10.64? on a quick calculation. Then the p2 12's ported would need? hmm.....7.2 cubes?

if thats what specs call for then yes. you take into account an extra 2-4cuft for port displacement, woofer displacement, and optional (but recommended) box bracing displacement.

Edited August 24, 2010 by Kranny

[96Blazer]

should i go with what rockford tells me on the box specs or no? Because there have been people on here that have built to say alpines specs and people say things are too small like ports and such

[Guest]

should i go with what rockford tells me on the box specs or no? Because there have been people on here that have built to say alpines specs and people say things are too small like ports and such

alpine specs i have seen are proven wrong for "correct" daily use. but RF i have yet to see anyone doubt their box design specs.