View Full Version : Do these box calculations sound right?

02-06-2008, 10:57 PM
Im building a box for a 18" BL. I designed this box on the RE website, but for some reason it just doesnt seem right to me. It a L-ported box.

W=40" H=19" D=26"
port height=17.5"
port width=7"
port length 1=18.25" (long part on L)
port length 2=7" (little part on L)
box vol= 7 cubic feet
tune freq=32

Should i go with this box or is it wrong?

02-07-2008, 05:15 PM

02-07-2008, 05:17 PM
I tried too, nobody replied to my box help thread too. :(:(

here have a look http://www.caraudio.com/forum/showthread.php?t=290473

02-07-2008, 05:41 PM
It's actually very close. It doesn't take into consideration sub displacement so the net volume is actually closer to 6.8 cubes and the tuning frequency is just about 33hz. I would definitely brace that enclosure though as it will not be very sturdy with a sub like that and only using 3/4" MDF.

02-07-2008, 07:59 PM
Yeah i definitely need some bracing, probably a double baffle also.
Do you know of any good links on how to properly brace a box?