Which is better for a ported box? Is it better to keep a ported box seperate from one side to the other? Is there a performance difference if you have on big chamber for two 12's and combine the port size into one single port?

i believe both should be fine. the only problem with seperating is if you dont mae the boxes equal in size. also, if you're running stereo (which doesnt make much sense for subs...), you have to run two seperate chambers.

yup, he pretty much covered it. In my thirdgen boxes I usually provide shared chambers because it's difficult to get 2 equally sized chambers in such an odd box shape. If you do use separate chambers, in a sealed setup there's a little bit of room for a fudge factor. If you look at the low frequency roll-off of most subs in a setup with a system Q of .707 vs. .800 or even .900, you find that there really isn't a big difference, and the phasing isn't going to come into play either. Obviously it's better to have identical chamber sizes, but you can fudge it a little bit.

With a ported box though... you want them to stay identical in size.

sharing the same box for two subs shouldn't be a problem. it will also be eassier to make sice you are not gonna be working with an everyday rectangular box.

just remember, if the box is separated, and you blow a sub, you will still be at the correct airspace for the sub, if they share common air (i believe fosgate actually recommends this) then if one blows, it wont sound good at all.


adam

is ported much better than sealed for getting harder hits and nice deep bass?

harder hits? Yes. Deeper bass? No. Ultimately it depends on the sub too. Some are better suited for sealed, some ported.

Usually ported boxes will be 'louder' with less power.

For seealed applications, we reccommend one woofer per chamber. because if you loose one driver, the other can see almost 'twice' the airspace, and on some, not good for the driver.

ported, you can do a common chamber and be fine...