First, I'm comparing measurements of the LAB12 in free air and in a 0.6ft3 sealed box, with and without the prototype cooling system. The idea now is to develop the cooling system so it can be used on the 12π horn, but also possibly on others. Basically, there are still a lot of little variables to look at, but I am very happy with what we've found so far.

I'm still shaking my head at the fact that I didn't consider the push-pull plenum before asking Eminence to work on a woofer with a shorting ring. Shorting rings lose effectiveness down low, but the push-pull arrangement doesn't. This combined with the potential improvement of the cooling system is very exciting. Both of these can only do good things, and as improved motors with greater excursion are made available, they can take advantage of these improvements as well.

Thanks for asking; I'll keep you posted as progress is made.