I am considering changing from 2-250w sub plate amps that I have for two 12" Titanic subs in EBS enclosures to a Pro amp such as a Behringer Europower, QSC Crown etc. I also have a Behringer Feedback Destroyer, my concern is getting the same flexibility for adjustment for phase adjustement and whether this would be much of an upgrade. Should I consider having a second BFD? I would like to at least double my power to 500w a channel. The subs are located in the front and the rear of the room and my receiver is a Denon 3805. Thanks for any input.