I am about to build a box for my incoming BTLs. I reviewed the cut out sheet for 1 BTL that is provided on the forum but was unsure as how a box for 2 BTLs is supposed to look like. I am unfamiliar with how the different dimensions in a ported box affect the performance of the sub so I would appreciate some input.

2-BTL 12 4.9 cubic feet @ 32Hz

Edited February 2, 201114 yr by OMartinez

70'' wide what are you putting this in your house?

seriously what vehicle

you may want to put some bracing in there!

Is the vent 3 1/2" wide at the beginning and 7" at the end? If so, something is goofed up.

Cross-sectional port area needs to remain constant throughout the entire length of the port. You need to redo it.

Edited February 2, 201114 yr by RAM_Designs

Cross-sectional port area needs to remain constant throughout the entire length of the port. You need to redo it.

How about this

How can I check if the port wall I have measured out to 31 1/2" correctly tunes the port to 32hz? And thank you guys for your patience.

Edited February 2, 201114 yr by OMartinez

After researching some more on the internet I am utterly, completely lost. I'm eager to build the box and throw these bad boys in I just cant figure out how to calculate the dimension of the port. Help?

This gets you in the ballpark. Not 100% accurate on the tuning. Usually within a couple hz tho.

http://www.reaudio.com/speaker_box/LPort_Box_Calc.html

This is a very good calculator. Be sure when you download you change the file name to .exe or it won't open. When you use a slot port, don't forget to add in the box the shared port walls. I believe it explains it in the help menu.

http://cid-1e28f7d3956a626f.skydrive.live.com/browse.aspx/.Public?uc=1

I paid RAM Designs to design a box for me. Well worth it IMO, I didn't have a clue!