View Full Version : Ported box for 1 15" Audiobahn Immortal Sub

02-27-2005, 03:38 PM
I am wanting to make a ported box for my 15" Immortal sub. The recommended box dimensions from Audiobahn's website for the Ultimate SPL Bass Box are:

Air Space (Cu. Ft.)- 3.75
Port size (inches)- (2) 4 x 11.25
Port Vel. (%)- 12.72
-3dB (Hz)- 35
Tune Frez. (Hz)- 29.84
Sub Disp. (Cu. Ft.)- 0.7
Port Disp. (Cu. Ft.)- 0.184
Total Vol. (Cu. Ft.)- 4.5

I was thinking about the box dimensions being 18"x28"x16". But, I have never built a box before and I am not sure how the ports would look. Could anyone help me on this, show me kind of what it should look like. I think I have the dimensions so that it would come out about 4.5 total cubic feet but I am kind of confused about what the ports should look like relative to the rest of the box. Any help would greatly be appreciated.

02-28-2005, 03:20 PM
well your dimentions come out to 3.66 cu. ft. internal. go to http://www.rockfordfosgate.com/rftech/boxcalculator.asp
for a box calculator.