Kim I need help with box building for 4 DX12's

phd500
phd500 Posts: 75
edited May 2002 in Car Audio & Electronics
I got my friend to buy 4 DX 12's. They need to go behind the seet of a 86 Chevy pickup. I have come up with a design and I was hoping you could tell me if it would work. The box is 59"x15.75"x4"x5.25"x15.799" (W x H x top depth x bottom depth x front) the back of the box is flat and the front is sloped. I plan on using 1" of MDF for the front baffle and 3/4" MDF for the rest of the box. I figured that if I put 4 DX's in this box that they would have .7 ft3. If I put 4lbs of polyfill in the box will they work write. Or would I be better off going with 3 DX's wich would recieve .93 ft3 or I could make the box smaller to get the .85 ft3 of space. What do you think I should do. The subs will be getting between 1,200 to 1,375 watts altogether from a JBL BP1200.1. Do you think this will be compitition worthy?
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  • phd500
    phd500 Posts: 75
    edited April 2002
    So say the box is 15 3/4" high with a bottom depth
    of 7.5" on the bottom with a top depth of 5.25" and width of 59.5". Can you figure a box for the 3 or 4 12 for me please.
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  • phd500
    phd500 Posts: 75
    edited April 2002
    How much wider would the box need to be to supply the air space needed for the 4 12s. My friend kinda has his heart set (as do I) on 4 12's. And if we acomplish this, with the JBL amp powering the qortet, do you think the system will be compition woorthy? Could you give me a gues on about how loud it will be?
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  • phd500
    phd500 Posts: 75
    edited April 2002
    The top and bottom depth wouldn't matter if I made the box wider right? I think I can make the box about 60-67" wide, I was going to put the amp back there but I will just put it in the seat. Would that give me enouf air space. My plans for using the JBL got dumped, so could you recomend a amp that would push the 4 12s and cost around 4-500 dollars. I was looking at Interfire or Hifonics. Are these good amps? What other amps fit the bill?
    DO YOU THINK THIS SYSTEM WOULD BE COMPETITION WORTHY.
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  • Thom
    Thom Posts: 723
    edited April 2002
    It all depends on where you'll be competing...

    The install and set- up can really make or break the system so it's hard to say exactly how competitive it might be until you go to some shows.
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  • phd500
    phd500 Posts: 75
    edited April 2002
    Well we decieded to go with three 12 inch momo's instead. Kinda sucks cause thats what I wanted to go with. Guess I'll have to redo my system plans too. Do you think the 3 momo's will be allot louder than the 4 12' DX's. 12-1375 watts push 3 momo's? Thanks
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