PDA

View Full Version : calculating port area



Bender.
11-19-2008, 06:23 PM
my box is 11 cuft and my external dimensions are...

53.25" wide
24" tall
18.25" deep

i will not be using a side wall as part of my port...it will be in the middle between the subs...can someone either give me a link to a calculator or just do it for me? thanks

edit: o and btw the subs will be inverted so they dont count in displacement...and i want it tuned to 35hz

edit: i just downloaded winISD and i get a port that is 5.51" x 5.51" x 2.23"......something seems wrong

edit: o i think i have figured it out...you have to put in your opening size and it will tell you how long the port needs to be

9seconlives
11-20-2008, 03:12 AM
"edit: o i think i have figured it out...you have to put in your opening size and it will tell you how long the port needs to be"

Very good young Jedi....you answered your own question i think. but xhck here also.

http://www.bcae1.com/spboxnew2.htm
http://www.reaudio.com/speaker_box/LPort_Box_Calc.html

and are you seperateing the subs so they have their own chamber or airspace?

mcsoul
11-20-2008, 10:58 AM
Your not using enough port area.
Using a kicker two 15" L7's as my model
I figure you should build a 10" x 10"
port that is 13.22" deep. The net
box displacement is right at 10.5 cubic
feet.

Bender.
11-20-2008, 01:08 PM
Your not using enough port area.
Using a kicker two 15" L7's as my model
I figure you should build a 10" x 10"
port that is 13.22" deep. The net
box displacement is right at 10.5 cubic
feet.

after i figured it out i got a port that is 22.5" tall, 4" wide, and 11.3" deep
would this work?

edit: same airspace

ABSOLUTEAUDIO
11-20-2008, 01:25 PM
I ran your enclosure in bassbox pro 6 and the above port and the box in your first post would put you at 35.55hz with a port area of 90sqin. It would work well with your subs :D

Bender.
11-20-2008, 01:41 PM
I ran your enclosure in bassbox pro 6 and the above port and the box in your first post would put you at 35.55hz with a port area of 90sqin. It would work well with your subs :D

yep thats what i was aiming for

DBfan187
11-20-2008, 01:57 PM
http://www.carstereo.com/help/Articles.cfm?id=31

Bender.
11-20-2008, 05:01 PM
dear god i have tried winISD, re, and carstereo.com and i have gotten 3 different measurements

all are 22.5 tall and 4 in wide

winISD-----11.3
re-----------13.25 turn and go 8
carstereo--8.17

Bender.
11-20-2008, 11:21 PM
???

Bender.
11-24-2008, 01:28 PM
which one should i use?

Immacomputer
11-24-2008, 06:43 PM
You could do something like this and it will work:

http://i34.tinypic.com/732c61.png

That's right around 9 cubes tuned to 35hz with 135in^2 of port area. You will need bracing on that back wall though.