Im in the process of having a box built for my tahoe for a 18" BTL. my boxes dont always come out the way i want so i decided to have this one made by someone who knows what they are doin.. well me being the kind of person i am.. ill bring the info i have from him to you guys and hope to get some support or get me in the right direction. Guy is fully aware of the BTL's and has made several boxes for them in the past. He says he would like to make it 8.5 cubes tuned to 30-35hz and says he will give it a little bit more port area than Fi recommends... does this sound ok to you guys? anyone have something similar or done anything similar. I know here in the fi forums its says 5-8 cuft, tuned to close to 32hz and 12-16 square inches of area for port per cubic foot. with that information he says to give it a little more.. please guide me

What kind of power are you dealing with?

basically all the stuff in my signature \/ down there in the being built part.. sundown SAZ 1500, the 220 alt, kinetik hc2000 (maybe 2 since i dont want to run my stock battery with the kinetik i just bought).

If you are going to be running the SAZ1500D in your sig, it will not hurt to have the box at 8.5 cuft. I would tune to ~32-33.

100 sqin of port is plenty for a BTL 18. If he is going to do more than 136 sqin (guessing from 8.5 x 16), it is not necessary.

If you are going to be running the SAZ1500D in your sig, it will not hurt to have the box at 8.5 cuft. I would tune to ~32-33.

100 sqin of port is plenty for a BTL 18. If he is going to do more than 136 sqin (guessing from 8.5 x 16), it is not necessary.

x2, 8.5 cuft sounds prime!

Right on. Feelin better about this guy buidin my box already