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View Full Version : FREE 15" BOX DESIGN: 4 cuft @ 34hz (Sub up, port back)

SSS 18734
03-22-2009, 10:04 PM
Here is a simple design for member schackel (or anyone else who decides to use it). It's even short enough that it can still be used in most trunks. He will be using two of these boxes for a pair of Fi BL's in his Chevy Suburban.

After all displacements:
3.93 cubic feet
Tuned at 34.3 hz
52 square inches of port

(Displacement of a Fi BL 15 is 0.18 cubic feet)

Start out by constructing the base, sides, and the port.
http://img25.imageshack.us/img25/6787/step1pic.jpg

Finish it up with the two baffles. Outline the port and the walls on the baffles, and make the following measurements. Then find the center of the circle by drawing lines from corner to corner of the resulting rectangle. You can also move the cutouts to wherever you please.
http://img6.imageshack.us/img6/7161/step2pic.jpg

For the other box, just move the port to the other side of the box and flip the baffles.

terra
03-22-2009, 10:12 PM
why 2 boxes?

SSS 18734
03-22-2009, 10:22 PM
He wants to be able to take them in and out on his own.

on1wheel01
03-22-2009, 10:36 PM
ok i've always wondered what affect does making the l port wall longer inside the box or shorter

SSS 18734
03-22-2009, 10:44 PM
ok i've always wondered what affect does making the l port wall longer inside the box or shorter

I'm not sure what you're asking. Rephrase ftw?

bonesninja
03-22-2009, 10:44 PM
52 sq. inches of port....not cubic

schrummy
03-22-2009, 10:48 PM
its .723 cubic ft of port

bonesninja
03-22-2009, 10:51 PM
its .723 cubic ft of port

yeah i know...he has 52 cubic inches of port.....its 52 square inches

on1wheel01
03-22-2009, 10:54 PM
ok like on the re calc the port l2 one it puts it at 8" automatically

SSS 18734
03-22-2009, 10:54 PM