In the owners manual for my subwoofers it says that sealed box volume should be 1.2 cubic feet per sub and 1.2 cubic feet for ported as well. I always thought that ported box volume should be a little bigger. I want a ported box but i cannot find a ported box with 1.2 cubic feet of space per sub, i could easily make one but i dont really feel like going through the trouble of trying to get it perfect,and such. Any suggestions?

build one medium density fiberboard is about $20 per sheet which is 8 x 4 and you could make a sweet one with one sheet. Me and my friend buid boxes for a living and weve made some sweet ones!!!!

Here'* a couple ported boxes I found for you. They are all for 10" subs.

Dual and carpeted
MDF 10 Dual Slot Port Enclosures [DP10] - $88.00 :: Loudcustoms.com - The Home of Custom Car Audio and Accessories

Single and carpeted
Audio Enhancers KV10S 10" Slot Ported Sub Box - 1.2 cf ShipSound.com

Single and uncarpeted
Audio Enhancers KV10S Uncarpeted 10" Slot Ported Sub Box - 1.2 cf ShipSound.com

I need a dual 12 inch box.

RE Enclosure Calculator what kind of subs are we talking about?

1.2 cubic feet sounds a little big for a sealed box to me. It would make it sound real boomy, not very accurate.

A great place to find really great subs is www.partsexpress.com. look for the Dayton audio.

1.2 cubes for 12'* isnt really that big at all IMO. What brand subs are you running? There are tons of box calculators online as everyone has already posted but if you decide to buy a prefab box, I am a huge fan of audio enhancers. They make driver specific boxes and good one size fits all boxes as well. Audioenhancers.com

1.2 cubes, i guess isnt that big, i remember the 2 12" MTX black golds i had in a 3 foot vented box. Thing took up the whole trunk of my 85 Monte Carlo. Then i went to the Polk Audio DB series. The box got alot smaller. Im running a Dayton Quattro 10" now. .6 cubes for the slot loaded enclosure. This speaker is the most accurate sounding sub i have ever heard. Its loud too.

The subs are soundstorm stealth sts12D. Now i know they aint the best but they were all i could afford at the time. The suggested specs for a ported box for them are 1.2 cubic feet per sub with 4'' round and 5" long ports.

after displacement you may have about 1 cube per sub. It should come out decent for an affordable system. Rip out a quick box and see how it comes out. Please keep me posted. I love success stories from the audio forum. Makes me feel like we are getting results for all of our hard work and research