using the same space (cubic feet) that is needed for 2 subs, setup them up like in the pic with no divider. has anyone done this (i'm sure someone has) but does it sound good.

 

The pic you have shows the two woofers isobaricly loaded this will work and sound fine just make sure that they are wired correctly so the move in the same direction. Isobaric enclosures are rare but also very effecient designs.

 

thats not isobarik. That is a standard setup, just one woofer is out. Redbird just posted pics of his setup and he has it the same way.

Brian

 

what r the pros and cons of isobarik setups. also if a sub needed 1 cu ft of space would u need 2 cu ft for the setup shown in my pic or caould u get away with 1 cu ft

 

A properly designed isobarik enclosure has its advantages and disadvantages.

An isobarik enclosure allows you to fit 2 subs into a box that uses half the airspace of 1 sub would normally use. Due to a constant air volume between the two subs, you can also maintain equal pressure on all cone surfaces, which reduces cone flex and distortion. Isobarik enclosures have a very clean sound when designed properly.

Most isobarik enclosures have the 2 subs facing each other in a clamshell configuration. By putting the two subs as close to each other as possible, you're able to best maintain a constant air pressure between the drivers, which keeps the two cones the most stable.

The downside to an isobarik enclosure is that your total sensitivity is only as good as 1 sub would be in a normal box. This means that you will see a 6dB loss compaired to putting the same two subs into a conventional sealed enclosure. You sacrifice sensitivity for space savings and increased sound quality.

The principle behind the small box subs (pioneered by the Kicker Solobaric) basically are to mimic an isobarik design with just one sub. The sub had double the mass and a very rigid cone, and it revolutionized car audio.

But... the box pictured is NOT an isobarik box. It's just a sealed box with 1 sub turned around.

 

That is not standard. There are different ways to accomplish an isobarik setup besides the woofer cones directly facing each other. If you put them magnet to magnet ( not touching though) or cone to magnet, that is also isobarik.

 

it is standard as far as it is NOT ISOBARIC. It is just a box with two woofers, one in and one out. woopidy doo

 

I am not going to argue with you. It is isobaric, do your homework. It is not the same as one in one out, because the woofers are in perfect line with each other.

Look on the net and you will see pictures of that setup.

 

http://www.jlaudio.com/tutorials/isobarik/index.html

why dont YOU do some reading.

If that box is isobaric then every thirdgen box would be isobaric.


Isobaric

Isobaric

Isobaric

Isobaric

Find me a site that says that setup is isobaric please

Brian

 

It doesn't happen too often, but 89blackGTA is right.

That setup is one box with two woofers in it. That's it. It is NOT an isobaric configuration.

The pics that 89blackGTA posted are all forms of isobaric that I've seen. I'm sure there's more that only the most wild imaginations have thought of, but those are the basic desings.

You have to kind of think strange to understand isobaric, but maybe it will help 330hp_91RS understand.

Isobaric has to have "two" enclosures. One behind one woofer, and another between the two woofers.

The pic by the thread starter only has one enclosure. It's technically behind both woofers. There is no second enclosure between or behind either of those woofers.

See what I mean?

BTW, the white box on the right is the amp.

 

89blackGTA just put the smack down on someone

:hail:


Its a good thing he isnt going to argue with you seeing how your right.

 

I think I like the second a bit better


I want to know why he didnt want to argue with Jim

 

what about these setups, would they have any good pros to them?

 

2 setup

 

would the original setup have any good pros bcuz they r both in the same direction and hitting together.

 

or would it be bad bcuz one magnet is in a sealed box and the other is out in the open, different temps.

 

Ok smart guys, the only way that the box he pictured would not be isobaric is if he wired one of those woofers out of phase, otherwise, it's isobaric.

I'll argue with any of you about it. If two speakers are back to back and the cones are moving in the same direction, it's isobaric, it's like push pull but you can cut the box size way down.

Here you go: http://www.caraudiohelp.com/custom_c...udio_boxes.htm

BTW: You really layed the smack down.
I am over it if you are, I could care less if you proved me wrong or not. I was just trying to help that guy out.

 

You need to read a little more chief. That's NOT an isobarik enclosure no matter how bad you want to wish it was. An isobarik enclosure by definition is one that has a conventional sealed chamber, and another sealed area BETWEEN the two subs. The whole philosophy behind it is that when the two pistons (i.e. the cones) move in phase, the air pressure between the two pistons will remain constant, which will make it behave as one rigid structure with double the mass and double the electrical motivation. But... you still need the damned enclosure!

If you hooked up that abortion that you call an isobarik enclosure so that the two subs have the cones moving together, you'll get cancellation because as one's going in the box, the other is coming out. All you have there is a sealed enclosure with 1 sub turned backwards, and to get anything that resembles sound of it, you need to wire the subs out of phase so that both cones are moving away from the shared enclosure at the same time.

Mechanically and electrically, that box is 100% identical to any other sealed box with 2 subs.

All those pretty pictures you just posted are nice, but what they (and you) fail to mention is that you still need the fricking enclosure! All those pictures show is the actual mounting configuration of the subs. In the botched abortion that you're trying to pass off as an isobarik, the space between the subs is acting like the box. That's NOT an isobarik box. An isobarik box still has a regular sealed chamber aside from the volume between the two subs. Like I said above, the only thing the volume between the two subs is there to do is to couple the two drivers to mimick the behavior of one big rigid driver.

 

You could help him out more if you know what your talking about. Isobaric is made of a 2 chamber box in which one chamber is made very small so the speakers act as one.

Back to the subject
the ported box you have shown can sound very good but they are hard to tune and aslo need to be pretty large boxes to sound good. IMO go with either a pair sealed or one ported and tuned low. Is this going in a 3rd gen?

 

ya it's going in a 3rd gen. i mean i don't know much about subs and all but i just started tossing ideas around and see what people have to say about them. i mean i've been looking and so far i've found that an isobarik box with 2 subs is the same as one of those subs in a normal box. u just use less space. so if none of those pics i made would have an advantage then i'll just stay with one sub that i was gona get with a sealed box.

 

Just buy a better sub meant for smaller boxes

 

How can that be an isobarik enclosure if the rear box is ported to the outside air??

 

ya i was gona get an alpine type R but i've heard better things about Elemental Designs and they rn't much more than a 12in type R. i was looking at the e12K.44 / 14 it's like $135

 

That's the least of his concerns in regards to why that's not an isobarik.

 

ED makes very nice subs and their customer sevice is great. works well in small sealed and small ported boxes.

 

u know when i made that first pic i didn't even know what an isobarik setup was. i was just seeing if that box did anything good. like i sed b4, i know almost nothing about subs. and i can see that isobarik setups are very controversial. almost like with "is backpressure good or bad" on the exhaust board. i'm sure they have good things and i'm sure they have bad things but i'm not that into stereo systems that i would care, i'll stay plan and simple