So pretty much the cookie cutter DD Box that people have been using for 15" DD subs for almost 20 years. Shocker Sig likes that box too as would most other subs with high motor force critically over-damped woofer.
Pics of the build?
Well these drivers have a slightly higher vas/MMS ratio the cone is nearly 2" bigger than any other 15 I've seen and the stiff spider pack so they ok in 7 per but yea those over damped designs shine in big boxes until you start putting 8 to 10 per driver then 3 to 4 cubes is a must for mechanical damprning..
I'm guessing on the numbers but its notceablly louder than my previous system. I should have videos and scores this weekend to be sure on the numbers I'm super impressed. No doubt the loudest 2 15s I've ever heard. I can't wait to get the 9918 esps.
Btw. The subs sound EXCELLENT. Similar to the JBL gti!!