I have 2 infinity perfect 12.1s, and have them in a temporary enclosure, which I have no specs for. It is ported, and has no seperator in the middle... I'm only powering one of the subs right now because my front channel(bridged, infinity 7541a) does not put out near as much bass as the rear channel bridged... I'm thinking that the powered sub pulls/pushes the other sub, but the other sub has no resistance so it might damage something?.. Or am I just an idiot?