Port question???

[oxsign 1]

I'm trying to figure out my next box. The program I'm using is tells me that my port will be 5Tx10Wx17.5D. Now how much of an effect will it have if I was to change the opening to 3.5Tx11.5Wx17.5D?? I'm looking to tune it to 34Hz. Thx from the help.

Edited June 5, 2009 by oxsign

[KU40 173]

It depends entirely on the size of the box, which you didn't tell us. But lowering the port area, as you did, lowers the tune. For example, in a 4 cubic foot box, it lowers the tune from 38 to 34.5 hz.

[oxsign 1]

It depends entirely on the size of the box, which you didn't tell us. But lowering the port area, as you did, lowers the tune. For example, in a 4 cubic foot box, it lowers the tune from 38 to 34.5 hz.

The box size is 4.4net after all displacement. So by shortening the shape in one direction, but adding it in the other and not altering the Leigh still changed the tuning?

[KU40 173]

Well do the math. 5" x 10" port opening is 50 sq. inches. 3.5" x 11.5" is 40.25 sq. inches.