I am thinking of getting a pair of Tyler Acoustics PD80's. They are a very efficient speaker but still need lost of power to push those four 15" subs at higher volumes. Tyler can install a pair of 1000 watt digital sub amps for $1200. I was looking for a high output integrate to drive the speakers alone without the internal amps. I am not real sold on "PRO" digital amps. I also have to keep the system clean. Those huge speakers are a hard enough sell with the wife!
Buy the way YES they are going in a very large room (32X32) with vaulted ceilings.
I found a link to a amp manufacturer that Ty used at a show a while back, but for the life of me I can't find it again. It was not a big name brand. It did however put out 600 watts into 4 homs.