Need help with cabinet design please..

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I bought a used ford E350 and Id like to upgrade the audio system.

I need a subwoofer box for two 10" R.F. speakers maybe. I will power these speakers with a old school Rockford Fosgate Punch 150 HD in bridged mode which hasn't let me down since the 80's. I have one R.F. 10" RFP-1810 8 ohm sub from the 90's and thought I could pair up with a new RF 10" sub to run parallel for 4 ohm. But Im open to two new 10" subs.

Can anyone help me design a box which wont raise my bed up, to much? The particle board bed riser is exactly 10" .

I drew a profile of what would fit. The enclosure could be 48" wide and whatever depth but the height needs to remain 10"

The van is powered by a cummins so its loud. I think I better go with ported since I have the space.. But I want it tuned tight.. I don't need super lows.

Thanks

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OK I can post pics now.. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

The enclosure could actually be 12" tall maximum before it raises the mattress enough to cover the rear door speakers. but would then require raising the bed 2".