2 BTL 12's. The outside dims of the box are 17" tall x 24.75" deep x 33.5 wide. I am going to use a 8"pvc pipe and make my own flares but need help on length for 33htz tuning. Also with it being an 8 inch pipe do I have to have 8 inches from the back of the box to the end of the pipe? Also how long should the pipe be to be 33htz? Please help me with this.

12.80" for a 33Hz tune.

Are you 100% sure on that length? I just want to make sure before build cause I don't want to have to try to get it back out

12.80" did not take into account the driver and port displacement.

I come up with 15.6" for a port with no flare. You could add an inch or so for your flare end correction.

That will be 5.8 ft^3 net volume @ 33 Hz.

With 3/4" wood:

15.5 x 23.25 x 32 = 6.67 ft^3 - (2 x .18) = 6.31 ft^3 - (15 x 4.25^2 x pi) = 5.8 ft^3 net

You could also make the driver mounting baffle 1.5" thick. Add another .75" to the port if you decide to double the baffle.

Brian

Yep, forgot to take that into account.

Bad mistake on my part.

Ok. Thanks guys that helps alot