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unrated
12-26-2007, 11:25 PM
hey everyone, im in a bit of a jam, i have a 03 trailblazer EXT and i have 2 15" Rs, now my prob is i have very small room to mount these bad boys, my max box sixe is 46L x 22.5H x 16D, now i thought id cut the box down for an isobaric enclosure, so i can mount my 4 amps on a angle on each side of the inverted sub, can any1 help me out with an isobaric box or point me into the right direction to some1 that can, the only thing i know to do is reverse polarity of the sub, i will pay for a sketchup or any plans, just pm me

thanks

JimJ
12-26-2007, 11:28 PM
Isobaric isn't really a "box", it's a way of loading the subs...one way of doing it is face to face, with one of them reversed in polarity, you're right.

Take whatever enclosure volume you had calculated for the two non-iso R's and cut it in half.

yunvme666
12-26-2007, 11:30 PM
any idea on box size ya want?

unrated
12-26-2007, 11:35 PM
any idea on box size ya want?

46l x 16d x 12h or 16h(max)

yunvme666
12-26-2007, 11:37 PM
what do you want then a cut sheet i can put it in bb6p.........

brokeitagain
12-27-2007, 12:20 AM
i can do it in sketchup but how do i post it here?
i know it can be done i have seen it here before

unrated
12-27-2007, 12:33 AM
what do you want then a cut sheet i can put it in bb6p.........

whats bb6p

Rich B
12-27-2007, 12:34 AM
whats bb6p

Bass Box 6 Pro.

squeak9798
12-27-2007, 12:39 AM
Take whatever enclosure volume you had calculated for the two non-iso R's and cut it in half.

It's half the enclosure size of a single subwoofer, not the pair.

brokeitagain
12-27-2007, 12:41 AM
i have this done already how do i post it here ?

unrated
12-27-2007, 12:41 AM
It's half the enclosure size of a single subwoofer, not the pair.

so if the sub wanted a 4 cube box, id make it 2 cubes, 1 sub in the box, 1 inverted above it, would i still want the box cut in half?!?!?

brokeitagain
12-27-2007, 12:42 AM
correct

brokeitagain
12-27-2007, 12:42 AM
i will have to go redo that model lol

unrated
12-27-2007, 01:10 AM
i will have to go redo that model lol

http://imageshack.us/
to upload pics

brokeitagain
12-27-2007, 01:38 AM
i have a photobucket account but i cant up load that type of file

unrated
12-27-2007, 01:48 AM
i have a photobucket account but i cant up load that type of file

what type of file is it, save sketchup in 2D

IamDeMan
12-27-2007, 06:24 AM
Take whatever enclosure volume you had calculated for the two non-iso R's and cut it in half.

Actually wouldn't he use 1/4 of the space he used for 2 in a isobaric? I thought Iso allowed you to use HALF the requirements of 1 driver?


It's half the enclosure size of a single subwoofer, not the pair.
OK I was right in my thinking.

brokeitagain
12-27-2007, 06:35 AM
http://img.photobucket.com/albums/v238/brokeitagain/15rsagain.png
these are from the dimensions you posted earlier if you get me the dimensions you need i can redo them

in order to stack those you are going to need to use a spacer ring in between them to keep the surrounds from rubbing each other, you did not mention if you want ported or sealed

BrianChia
12-27-2007, 06:43 AM
Every isobaric pair is treated like a single driver with HALF the Vas double the Mms and double BL. So the enclosure volume for 1 driver might be 2 cf. For 2 drivers it would be 4 cf. For 1 isobaric pair it would be 1cf. For 2 isobaric pairs (4 drivers) it would be 2 cf.

So Jim is right.

brokeitagain
12-27-2007, 06:48 AM
actually squeak is right.by your math

BrianChia
12-27-2007, 06:52 AM
explain please?

1 isobarik pair (2 drivers) is half the size of 1 non-isobarik driver
2 isobarik pair (4 drivers) is half the size of 2 non-isobarik drivers

OP is using 4 drivers (2 isobarik pair)

EDIT:

Haha, I'm an idiot. OP is only using 2 drivers (1 pair). I can't read. FTL.

brokeitagain
12-27-2007, 06:55 AM
hey everyone, im in a bit of a jam, i have a 03 trailblazer EXT and i have 2 15" Rs, now my prob is i have very small room to mount these bad boys, my max box sixe is 46L x 22.5H x 16D, now i thought id cut the box down for an isobaric enclosure, so i can mount my 4 amps on a angle on each side of the inverted sub, can any1 help me out with an isobaric box or point me into the right direction to some1 that can, the only thing i know to do is reverse polarity of the sub, i will pay for a sketchup or any plans, just pm me

thanks


i read only 2 drivers

EDIT: You beat me to it

IamDeMan
12-27-2007, 07:54 AM
Every isobaric pair is treated like a single driver with HALF the Vas double the Mms and double BL. So the enclosure volume for 1 driver might be 2 cf. For 2 drivers it would be 4 cf. For 1 isobaric pair it would be 1cf. For 2 isobaric pairs (4 drivers) it would be 2 cf.

So Jim is right.If the guys was doing a pair of isos, yes. He isn't though. He is using the pair of drivers he has to make [1] iso(2 drivers).

IamDeMan
12-27-2007, 07:55 AM
EDIT: You beat me to itBah, same here.

BrianChia
12-28-2007, 06:56 AM
http://img341.imageshack.us/img341/6011/215isobarik16cf31hzbjc3.png

http://img264.imageshack.us/img264/6356/215isobarik16cf31hzie6.png

brokeitagain
12-29-2007, 04:54 AM
http://img341.imageshack.us/img341/6011/215isobarik16cf31hzbjc3.png

http://img264.imageshack.us/img264/6356/215isobarik16cf31hzie6.png

HOLY ****!!!!! I failed like a mofo compared to that. Nice Work Brian!

Bake
12-29-2007, 11:06 AM
Hells yeah, bad a$$ Sketch Brian.

unrated
12-29-2007, 12:23 PM
if any1 is wondering what the window is at the bottom of the box is to view a second battery in the storage unit in the trailblazer

Thank You Brian Chia for an awesome box design, i cant waite to build this bad boy

if any1 is interested heres whats going in

pioneer 7800 CD Player
Valor DVD player
TKO 12.5 flip down monitor
2 15" Alpine Type R
2 Hifonics BXI-2006D
2 Hifonics Zeus 4 Chan
4 Sets Alpine 6.5 mid

audioholic
12-29-2007, 01:05 PM
I dont really see the point in putting a window in a isobaric box, one motor is already exposed. But whatever floats your boat. :)

djman37
12-29-2007, 01:13 PM
I don't think he'll see much improvement in ISO loading type-R's. The isobaric works by stiffening the cone to allow it two function properly in less airspace. From what I've seen, the type-r has a 100% coverage dustcap which = no benefit in clamshelling.
My .02.

audioholic
12-29-2007, 01:36 PM
I don't think he'll see much improvement in ISO loading type-R's. The isobaric works by stiffening the cone to allow it two function properly in less airspace. From what I've seen, the type-r has a 100% coverage dustcap which = no benefit in clamshelling.
My .02.You are confused, that is not how isobaric improves performance, by stiffening the cone. As already stated earlier, it does several things like double BL motor force and halve the Vas... because they subs are working as if they are one.