I have two subwoofers and figured since I can really only install one sub box without taking up alot of space, I can maybe install them in an isobaric configuration. I have an amp that will push them (old style punch 200 ix), but will I benefit at all?

 

What do you mean by "isobaric"?

 

When you're tight for space, an isobaric configuration is a possibility, but it's not seen too often due to the downsides.

On a driver for driver basis, you only need half the amount of airspace (i.e., box size) as you would if you designed the driver into a typical box. The downside is you'll lose around 3dB of efficiency when compared to the single driver design...to gain that 50% efficiency loss back, you'll need to drive it twice as hard.

So, by doubling the number of drivers and doubling the power to them, you get X amount of sound power in half the space (not quite, when you consider the second driver takes up some space sticking out of the box). Unless you plan on taking up the entire trunk, I would consider this a last resort.

 

Well, isobaric means (in car audio) where the pressure inside the box is equal to the pressure outside the box (in terms of isobars) Im a bit hazy on the subject, but basically it looks like an ordinary box, except its measured in a way that when a subwoofer has full excursion. the, the pressure on the inside of the box will be the same as on the inside of the box. Somthing like that, thats not a 100% accurate but its the best I can remember. Isobaric boxes are huge and provide massive bass response. There is no way you can fit an isobaric box into an s2000, the are simply massive. Here is an example of an isobaric box....





Isobaric boxes are usually about 4 inches bigger than the subwoofer you are installing into it.

I will try and dig up a better explanation.

 

[QUOTE]Originally posted by MacGyver
When you're tight for space, an isobaric configuration is a possibility, but it's not seen too often due to the downsides.

On a driver for driver basis, you only need half the amount of airspace (i.e., box size) as you would if you designed the driver into a typical box.

 

interesting...

 

Isobaric boxes have 2 drivers, one facing the other, in a sealed box. One is mounted as shown in the pics above, but a second driver is placed face down onto the first driver. By doing so, you're essentially getting the response of two coils, but you're also required to drive those two coils (the characteristics of which add in the log domain).

 

[QUOTE]Originally posted by MacGyver

 

Since one driver needs to sit outside of the box and is relatively open to damage, you'll end up taking up a lot of free space.

 

You can also have both driver inside the box. One is mount normally (with the face showing), the other completely inside the box facing the other speaker.

An Isobaric box needs half the volume the single driver would normally require but the 2 drivers only deliver 50% of the efficiency as MacGyver has pointed out...the flip side is if you but in 2 isobarics you would GAIN 3db. So in the same box footprint that a single driver require, you would net 3dB because of the extra cone area.