Yes, cabinets do things. Heh.
It's hard to explain, best to grab a sim program and play with it. Are these standard ported cabs or folded or what? Once I get back, if you could get a rough idea of the volume assuming it's nothing fancy in terms of folded or t-line I could so a sim for you. It seems plausible to me, assuming it's a simple ported design.
Oh and that guy is a douche...