help with box design please

[doox00 10+ year member]

I have an ID IDQ 12 D4 V.3 sub in a sealed box right now, I would like to build a ported one to try it out in.

ID recommends a 1.9 cubic foot box tuned to 28hz with a 4" round port 13.80" long.

The box I have room for can be no more than 35" wide and 16" tall, depth can be up to 14" or so. So if I have a box that was 22.5 x 14.5 x 10.5 (internal dimensions) that would give me 1.98 cubic foot box (sub has .05 displacement). What dimension/length would a square port have to be to be tuned to 28hz? The port would be 14.5" tall.

thanks for any help

** I was told you have to count the port as displacement as well so any help in designing would be appreciated. thanks!

Click to read more...

 

[dbeez 5,000+ posts]

Mike465 on here can help you..

 

[doox00 10+ year member]

Mike465 on here can help you..

thanks, I sent em a pm.

 

[dbeez 5,000+ posts]

thanks, I sent em a pm.

You will be happy you did...

 

[cj407]

i've got a box designed for you specific application.

 

[doox00 10+ year member]

someone linked me this site.

http://reaudio.com/speaker_box/LPort_Box_Calc.html

What I came up with is 28" x 14" x 14" Port width 1.75" L1 11.5" L2 17" shows tuned to 28.8hz. Box is 1.98 cubic feet after port displacement. Sub is .05 displacement, giving me 1.93, close enough to 1.9.

This look okay?

 

[doox00 10+ year member]

Here it is so far

 

[doox00 10+ year member]

more progress

 

[azimuth 5,000+ posts]

lookin good. still have all your fingers? JK. looks like port piece 1 got away from you a bit on the table saw.

 

[doox00 10+ year member]

lookin good. still have all your fingers? JK. looks like port piece 1 got away from you a bit on the table saw.

yep, everyone survived though //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[doox00 10+ year member]

Wow!! this box is SOOO much better than that sealed.. holy shit it pounds now.. very happy //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Now I need to figure out what to do with my amps again.. had an amp rack made but now won't work with new box.. thats a job for tomorrow I guess.

 

[AllDayMJ 10+ year member]

lol, i was gunna tell you were way under enough box volume.... but yea, nice build you prlly will and do love the new ported enclosure..

-mj