You have too think thats 2 13.5'' woofers.. its actaully alot of cone area. And another thing is, is that he probably matched those subs perfectly for wattage. 1000w is probably all those two can handle.. Depends on the vehicle and what not as well.
Ive heard alot of trunk cars with 3 10's 3 12's 2 15's. My single brahma would give anyone a run for their money, that sub gets down right nasty off my kx 1200.1. I think im going to put the saz on it and let the kx sit around. See what the difference will be.
OP your box must be WAY off man! Plus i cant see how your car can keep up powering that amp. Those RF's take power to make power. Probably why everything is getting hot.