View Full Version : Do you see a problem with this box?

Bill T.
01-23-2004, 07:49 PM
External Dimensions

38" Wide
20.5" Deep
16" Tall

14.5" x 4" x 15"

3/4" MDF, no bracing.

I came up with 4.85 cu.ft after displacement and 58 sq" of port area. Tuning is at 33Hz.

Does that look right?


Bill T.

01-25-2004, 01:53 PM
1.) The dimensions you gave are external so...36.5 x 14.5 x 19 / 1728 = 5.82cu'
2.) If the port is sharing a side with the box, then it's safe to say that the port displacement is .57cu'? (4.75 x 14.5 x 14.25 / 1728 = .57)?
3.) You did not post the sub displacement so I'm guessing .4cu'?
4.) I got a tuning freq. at about 38Hz (would have to be 23" long to get 33Hz.)

Bill T.
01-25-2004, 02:04 PM
When measuring port length, isnt it from the edge outside to the middle of the 90 degree bend, then again from the 90 degree middle point to the end of the inner board?

I have 2 designs in mind and I keep coming up with 36-38Hz tuning.

Bill T.