02 GMC Sierra 1500 ext cab

[RAM_Designs]

Not enough room once you take into consideration subwoofer, bracing, and port displacements. With 13ft^3 gross volume you could probably do three 15's, but you'd need to do a wall to do all four subs.

The sub displacement for 4 is .704 ft^3 and bracings won't take off more than a cubic ft at the most plus the port volume would be .36ft^3 if I tune it to 33 Hz going 8hx10wx7.85l (inches) and its not a slotted port so putting all that together it seems like I do have enough room

I was under the impression that you only had 13ft^3 of gross volume to play with. Also, you need to use a lot more port....shoot for 150-175in^2 if you're using decent woofers.

Edited March 19, 2012 by RAM_Designs

[ChevyBoy95]

you can easily get enough for 4 15s with doubled up all around, bracing, port, and sub displacement included.

[Brandon15zzz]

Technically you don't need 13cubes for 15's. Buddy runs 4 15's in 6 cubes after displacements. it is a spl oriented setup but he could play music. Also the box I'm working on now should be about 5 after displacements for my 2 15's. I have basically the same truck. I know it can be done. Just have to test.

[99fullsizechevy]

My current box is 28x58x20 and is 11 cubes after displacment and the top is tripple baffled right above window line, seats reclined comfortably, i have plenty of room to mount my batt under the box, but it fits in front of the box in the floor.. U could do 58 wide 28 tall but have it 20 up top depth and 26 at bottom and angle the baffle and gain more room.. Id say that would yeild 14 cubes give of take, or build a frame and do a wall.. Ive taken some measurments and i figure up over 20 cubes before displacment easy... It can be done, do not let anyone tell you otherwise