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View Full Version : help doing port measurements for 2 15in. l7's



tank65
11-01-2006, 04:36 AM
well i was using this http://www.carstereo.com/help2/Articles.cfm?id=31 and this is what im confused about. when i put in my info it gives me 100.55 diameter. but at the bottom when i do the width and height im going to have 2 slot ports. so i would do 50in diameter per sub correct? if so im getting to 12.5 height and 4 width and 24inches in length. im just making sure if i did that right or not

tank65
11-01-2006, 05:25 AM
i went 18 height by 2.75 for the port so it got a better look and it came out to 16.5 length. so thats all done and settled with if i did that right which i think i did. This is my box tuned to 35hz.

http://i3.photobucket.com/albums/y72/tank65/2006-11-01_052316.jpg
http://i3.photobucket.com/albums/y72/tank65/2006-11-01_052239.jpg

tank65
11-01-2006, 08:24 AM
turns out the first design wont fit my trunk. so i came up with this, http://i3.photobucket.com/albums/y72/tank65/2006-11-01_082414.jpg

that should just barely fit in there.

tank65
11-01-2006, 03:25 PM
Sketchup. its a free download and theres a good tutorial on the forums somewhere on how to start using it

here you go http://www.caraudio.com/forum/showthread.php?t=180054&highlight=sketchup+tutorial

kicker06
11-01-2006, 04:11 PM
I would Suggest Double Baffle.

Lots of port area =)

tank65
11-02-2006, 12:19 AM
ok well its between the box in the post above. or this one.....its a mammoth.......after displacement its a wopping 14.06cubic ft. tuned to 35hz with measurements of 35.5in. wide

40in. deep

17.5in high

and the port being

14.5inches high and 8inches wide.

so its a toss up. stick with this box or the one before.

http://i3.photobucket.com/albums/y72/tank65/2006-11-01_204439-1.jpg
http://i3.photobucket.com/albums/y72/tank65/2006-11-02_000640.jpg
http://i3.photobucket.com/albums/y72/tank65/2006-11-01_221308.jpg
http://i3.photobucket.com/albums/y72/tank65/2006-11-01_204439-2.jpg

kicker06
11-02-2006, 01:08 AM
Make your port longer. 14.5cu is WAY tooooo big, you want like 9cu total.

tank65
11-02-2006, 01:11 AM
alright, ill see if i can make it smaller depth wise because i like this design

kicker06
11-02-2006, 01:32 AM
It's nice, but you will be free airing those subs with that much space. 4.5cu each driver before port will work well, make you port longer, the height and width are good, but you want a longer port. Watch out because if you change the box size and port length, you will change your tuning.

-Smaller box (4.5cu/driver)

-Port (longer port)

tank65
11-02-2006, 01:52 AM
ok resized and all. also retuned, i switched from 35hz down to 30hz because i do listen to alot of hip hop.

here it is http://i3.photobucket.com/albums/y72/tank65/2006-11-02_014944.jpg
http://i3.photobucket.com/albums/y72/tank65/2006-11-02_015203.jpg

the port is 17.5x5.75 and 21in. long. after displacement the box is 9.02 cubic feet.