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Depends on the enclosure. Get a copy of WinISD. There is a tutorial in the FAQ section on the second page. It should allow you to see how a bigger box will affect low end extension.

Link to WinISD thread: http://www.caraudiocentral.net/forums/s ... d.php?t=44

okay i will do that,, i thought that ported would make it go lower, well what is the drop off point for most sealed enclosures if you don't mind me asking?

Thanks for the responds..

Generally going with a larger box gives you better low end extension. I might try stuffing your box with poly-fill first to trick your box into thinking its larger.
Plus, going with a ported box will give you more output at a certain frequency. It will get louder, but not necessarily any lower.

Hello guys, well i have a question for the box builders out there, well right now i'm running 2 12inch infinity reference 1230 subs in a sealed enclosure, well it's no hitting low enough for me, so i want to go ported but i don't have the room for two 2feet enclosures well that's what infinity recommends, i would like to know if i make the box smaller then recommendation but still tuned to 30HZ will it sound like sh*t, like if i made the box like 1.50cuft instead of 2.00Cuft.. i know it's a pretty big difference but thought i would still ask.. Also my Local dealer said i should try going with a smaller sealed box Infinity recommends 1.25Cuft he said to try a 1Cuft box instead but i don't think i will get the lows with that maybe more punch..

Please help..