Does anyone know if these subs are in three seperate chanbers or is it one open hollow chamber??

like this one is seperate chambered

 

hard to tell why you wanting to know?

 

most likely seperate

 

I wanna know if its 3 +/- terminals or just one, for amp wiring reasons

 

What would be the difference in terminals? With or without them, just wire it how you need it.

 

If that's a pre-fab MTX box sold as a package, it's likely already wired up to one 4 ohm terminal which means it's likely 3 x 12ohm subs and one chamber. The only reason to have separate chambers is for separate amplification of each sub. That or it can be used to make your box more rigid ... which you can also achieve with internal bracing.

 

Being the majority of MTX mono amps optimally perform @ 2Ohm I would assume it to be configured that way. Although a 2 or 4Ohm configuration may be available.

I have to disagree with your theory of why chambered boxes are made like so. More primary reasons for chambering is for cancelations and mixing. Although multiple subs *could be in a single opening, performance may be strained by sharing the same airspace.

 

Well, I'm assuming 4 ohm just because that's the most common configuration. Truth be told, I have no experience with MTX themselves.

Cancellation and mixing does not happen in any substantial way with subs of the exact same type firing in the same direction. If you get cancellation in the box, wouldn't you get the same cancellation outside the box regardless of whether they are all sharing airspace or not? I know I had 3 8's back in the day in a single chamber box and they kicked some serious butt (until JL's patented shi.tty surround wore away).

That said, if you mix sub sizes, brands, locations (firing at each other) even DVC vs. SVC and you will have much more of a chance of cancellation and mixing.