Hi guys, I recently bought a use avrx3100w and cant figure out something. Is this receiver really 7.2? My question is about the .2 I have plugged 2 subs but when I do the auto set up only one sub pops on the screen., and when the set up for sub comes I can hear the signal from both subs. Soud to me that this is single sub out only with 2 rca jack's on the rear of the receiver labeled sub1 and sub2. Is that what it is or I am doing something wrong?