Do you see a problem with this box?

[Bill T. 10+ year member]

External Dimensions

38" Wide

20.5" Deep

16" Tall

Port

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?

Thanks,

Bill T.

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[Trixter 10+ year member]

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. 10+ year member]

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.