box design help

[germandark]

I've been pondering on the design of the enclosure for my truck for a while now.

Its a Ford Ranger standard cab, long bed. I have already mocked up the basis in Sketch Up.

http://i11.photobucket.com/albums/a161/germandark/boxblank.jpg

There she is...

Anyways I'm going to have 8 - 12" DC Level 3's in there. I'm liking the idea of a 4th order but I'm noobish with building them...I know how to but have no experience and my skills in Sketch Up are impaired by my lack of knowledge on how to use it in its complexity.

There is enough airspace to do a 4th order there, I checked...I think. haha.

Please help me out, I've tried several things and I am over thinking it all.

BTW here is a RS for the sketch up file.

http://rapidshare.com/files/177117697/blank_larger_mod.skp

[germandark]

ttt

[Chuck]

I can see what I can come up with.

[iamamp3pimp]

please do.

ive been trying to work on this, but it seems everytime i start something else comes up.

there is definate;y enough room for a 4th order.....maybe even a series tuned 6th order...

[Chuck]

Seems the tricky part is getting all the cone area in. Theres definately enough room, but its hard to get it all in without making it weird. I keep trying different stuff...

[Chuck]

Well I got it... I ****ed up the right (drivers) side though, and dont feel like fixing it. Its just a little off.

But if both sides were like the passanger side... It would be just a hair over 8 cubes sealed, 10 cubes ported, with 214.5 sq in of port tuned around 52hz.

The 2 front subs would need to be reverse mounted so the magnet stuck out. Beasides that, its right on, Im pretty sure.

Heres the file.
http://rapidshare.com/files/177362340/dylan.skp.html

And heres what it looks like.
http://i16.photobucket.com/albums/b6/galamonkey/dylan.png

[germandark]

coolz. one other thing....I want lowwwwwws. I don't really care for competing to much, I will but if I get crappy scores then whatever. I wanna MOVE SOME AIR. thank you tho chuck, ill keep this in mind.

[Chuck]

Yeah, the 1/1.25 4th orders for the 12s always plays crazy lows.

I say just do 8 15s sealed. Now that would be sweet.

[germandark]

15's wont fit. the max height is 18"

[Chuck]

If the max height is 18", then with with a sheet of MDF on top and bottom, you still have 16.5". Thats more than enough to fit a 15 with some room to spare.

[germandark]

math and me don't have a good past. same with logic somtimes. its an idea

[BIG RED]

not if they dubbel layer it!

[Chuck]

If you put 2x4s or threaded rod inside the enclosures and then glass them, 1 layer would be just fine.

[germandark]

I am pretty stuck on doing 8-12's but 8-15's is tempting because I like the idea of it being a "ground pounder." I keep punching in the info for a 4th order on a calculator because my math skills are limited by my dyslexia...I just mess up too much. The gain is over 7 db, which scares me, when its a 0.7 S factor when tuning to 30 hz. I would appreciate the help everybody.

btw here is the better revised sketch up file.

http://rapidshare.com/files/177117697/blank_larger_mod.skp

EDIT: I MADE THE WALLS TO HIGH, IF YOU GUNNA HELP ME OUT BUMP THEM DOWN 3/4th AN INCH.

[Chuck]

WTF is an S factor?

[germandark]

Chuck, I thought you were crunk-ER than me?!? hahaha

its the efficiency of the enclosure. its as close as you can get to being perfect. the higher the S factor the narrow the passband with more efficiency and the lower the S factor the wider the passband but less efficiency.

I've tried using winisd to simulate the "ripple" of a S factor of 0.6 and it really isnt that bad.....like -.3 of so db and with 0.6 I lowered the gain below 3db. mucho help ploxxx

[germandark]

nothin? damn I'll keep drillin' away at it till I got something good