anyone good at designing large clamshells?

[Ryan shaw 10+ year member]

tried doing a wall of 4 18" tc 5200's, to fit all the woofers on the faceplate was impossible. 1" off //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

so now i'm thinking of doing a clamshell wall. i know i can build one but i just cant design one. want to play from 25hz-35hz very strongly and for it to sound good. no metering here

max dimensions are around 44"wide, 34" tall and 28" deep.

anyone that can help at all is appreciated

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[mast240 10+ year member]

that depth is goin to kill you on a clamshell bro... check out my build... and look at how much depth i had to put for my 4 aq 18's... i ended up with almost 4 ft of depth

also, even with the best design, you're going to have to make lil changes here and there on the fly... but i can whip something up for you tomorrow, if you want

 

[Ryan shaw 10+ year member]

couldnt there be a clamshell like with 2 on the top pointing somewhat towards the bottom of the vehicle and 2 on the bottom facing up? kind of like this one

 

[mast240 10+ year member]

you mean like this??

the one i'm currently building... and like i said, your depth is going to kill you... not willing to get rid of the back seats?

 

[Ryan shaw 10+ year member]

gotta be able to carry 4 people //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif but yes exactly like that. and if i drop the height to like 28-30 i can probably get like 34" of depth.

and these 5200's only need like 4 cubic feet each in a ported box, not sure what that means for a clamshell though. dont even really understand them fully lol

 

[mast240 10+ year member]

well, with a clamshell, you normally will have them angled at 45 degrees... but you gotta remember that this will take away half of your available air space, and if you angle them anything less than around 30 degrees, you end up getting into the 4th order world.... which can be a tuning nightmare

 

[mast240 10+ year member]

you might be able to pull it off with those dimensions, now that i actually did the calculations... depends on your baffle length, angle, and displacement tho

 

[Ryan shaw 10+ year member]

if you could pull it off i'd paypal you like 20$ lol. i really want to do this but dont want to end up building something i cant fit in my car. i can do a wall with 3 18's but i think 4 would bay way cooler and get much lower and louder

 

[mast240 10+ year member]

pm me all the info you have (sub parameters, dimensions, tuning your looking for, etc..) and i'll work on it a lil tomorrow, and try to get it done in a day or two (still working on my own build too, lol)

 

[Ryan shaw 10+ year member]

pm'd and dont worry i understand, would like to have them by the weekend though if possible //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[mast240 10+ year member]

replied... i'll prolly play around with it tomorrow night, once it gets too dark to work on my build... and i have all day friday off, so i'm sure i'll have time then

 

[truckramrod 10+ year member]

well, with a clamshell, you normally will have them angled at 45 degrees... but you gotta remember that this will take away half of your available air space, and if you angle them anything less than around 30 degrees, you end up getting into the 4th order world.... which can be a tuning nightmare

I learn something new everyday.

 

[mast240 10+ year member]

learned from experience, lol

 

[hispls 5,000+ posts]

All things being equal the output gain between 3 and 4 subs would be on the order of .7dB. You'll probably lose more than that sacrificing a bunch of volume. Just saying.

 

[mast240 10+ year member]

how do you figure .7 db? a proper clamshell with 4 18's will have a good amount of gain against a wall with 3 18's.... all things being equal