Good point!
Besides the fact that a "divider" will make te box stiffer, just how important it is to have seperate chambers is a matter of some dispute. The parts of the argument that can be backed with something like real data I will put forth here.
If all your woofers are in parallel and run off the same amp, they should all be in near perfect phase with one another, thus, they may share common airspace. Some people say that sharing the airspace is benificial for SPL, I've never seen this proven per se.
If multiple subs are wired in series, they is a slight phase shift from driver to driver. They CAN share airspace, but it's beter to have them in seperate chambers. The phase shift is very slight, but if there are more than 2 subs in series, it becomes more pronounced, thus making the seperate chamber even more necessary.
When driving mulitiple woofers off multiple amps, seperate chambers are HIGHLY recomended. Unless you have an ocsilliscope to perfectly match amplifier output and phase response, sharing airspace can be very detrimental to overall performance.
That about covers it, gotta go!
