I have a subwoofer box I inherited from my cousin when he upgraded with some 12" kickers inside and I was looking and it seems like it needs to be set up as push-pull. It has essentially 3 chambers, two behind each of the two subs (one chamber each) which are ported, and one enclosed that has both subs facing inward toward each other. It would seem like they need to be wired with reverse polarity to one another to create a push-pull system, and when I do so, it gets louder than any other configuration. Here is picture I found online of a similar setup (although not at all my setup or brand), but is a good illustration of what I am talking about: http://www.autotoys.com/pics/thumbs/t_BNPS102.jpg. What I want to know is if this is isobaric. If so, it seems like it isn't conserving space like an isobaric system should and is really just making the system pointlessly weak. Any thoughts?
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Is this considered an isobaric subwoofer enclosure?
Verified answer
It would be isobaric if you mounted a 2nd subwoofer in front of each of the existing drivers (cones facing each other) and connected each pair out of phase.
The enclosure appears to be a "dual single reflex bandpass enclosure". Wiring the subs out of phase would provide added reinforcement as the subs alternately compress the air volume in the center chamber.
The whole idea of isobaric enclosures is to be able to have a smaller enclosure. This one looks anything but small.
Isobaric Subwoofer Enclosure