So I got one of these the other day, and after owning their previous Isolation-cabinet I was a bit sceptic. But this 4x12 looking one is actually a lot better sounding. Check middle of the video to see how it works.
It has one Celestion V30 inside and it's actually pretty silent, I'm cranking the Rectifier pretty hard in this video.
[VIDEO]http://www.youtube.com/watch?v=HGEk5l7O4SQ]Mesa Boogie Dual Rectifier // Randall ISO4x12 - YouTube[/VIDEO]
Killer! Sounds awesome