Port Volume Calculations... I F'ed up!

E

Energize

Audiophyte
Hey guys,

So i think i stepped in too quickly making my subwoofer before knowing everything that i should have. When i made my box for my subwoofer, i decided to use a slot port that runs along the bottom of the enclosure. My box measures 22h x 24l x 16w internally, (4.889 cu ft) however, because i ran the port along the bottom (3" space between, with 2 slots), this takes away from my Vb doesn't it?

I'm kinda pissed that i calculated out the bracing, but it didn't even occur to me to take out the slot port, as there is still lots of volume between the 1" slot pieces. I had thought i was coming out with 4.05 cu ft with the port, but i guess im actually sitting at 2.5 cu ft, which is kind of upsetting considering all the effort i put building this sucker. I did stuff it quite heavily, and might even stuff it full if you think it would help make it "bigger". There's really nothing more i can think of doing...

Here's a little snap shot of what a side cutout of my box would look like.
The centre pieces would be the bracing, with a bunch of holes drilled in to allow flow but give stability. Total port length would be 78 inches (6+21+21+24 are the slot pieces, plus intermediate space following down the middle).

I used the Kappa perfect 12.1 as the driver, due to its high reviews and low cost, and i was trying to make a big bang for buck sub. Does my mistake really cost me that much? I modeled it in WinISD and BassBox Pro, and it does seem to lose a little low end bass, but id like to hear from the pros on what they think, and what could possibly be done.

(keep in mind, i do have a BFD on the way ;))

Thanks!

.___________
|........|........|
|........|........| <- Front firing driver with plate amp on opposite side
|___...|........|
|..._________|
|_________...|
.___________|
 
Last edited:

Latest posts

newsletter

  • RBHsound.com
  • BlueJeansCable.com
  • SVS Sound Subwoofers
  • Experience the Martin Logan Montis
Top