Currently have a 12" BTL (D2, loaded, daily) powered by 2500D.

Box is 2.5cuft @ 32Hz (after displacement). External dimensions 27" x 18" x 16". Port is 14.5" x 2.5" x 40"? (forget, used subwoofertool.com few years back)

Would like to get a bit more out of the lows.

They hit good as it is now, even down to 25Hz, but they could probably be better.

Just wondering what I would need to do to make another box that specializes in the bottom end more.

Smaller box? Larger port?..etc.

Was thinking, maybe 28-30Hz tune?

Maximum dimensions: 31" x 18" x 16"

Was thinking about something like this.

SubwooferTools.net Calculator

However I want to retain an L-shaped port.

So, I would add the length of port walls together. In this case 13 + 13 + 5.5 = 31.5 port length @ 14.5" (port height) x 3.75" (port width)?

When I duplicate the dimensions of the box found on subwoofertools into RE audio calculator, I get a tune of 37.14Hz.

How could they be so different!?

So yeah, still need some help.

Edited May 29, 201015 yr by b34tBoX