I've been exchanging PMs with Tony123 on his theater build and seeking his advice since our rooms are so similar. I am planning on going with the Atlantic Technology 8200e front speakers (90 db sensitivity) rated at TXH Ultra2 for large rooms (>5,000 cu. ft). This was Tony's PM to me that I thought should be shared on the forum (he gave me his permission to share. He has the Klipsch 650 THX fronts, 96 db):
90db is on the low side. I don't know how to do all the math, but there are guys that can determine for you what db you'd be able to reach at your listening position. And remember, you want the system to be capable of several db beyond your expectations.
I'm not so sure that combination would give you reference volume in a room the size of yours. My first system in this room was the Klipsch Ultra2 at 96db and running off a Denon receiver at 120wpc. It reached reference level, but was straining. I eventually blew a tweeter, and it was just not pleasant at high volume. That's all changed now.
Remember, an Ultra2 system is designed for a space up to 3,000cf. So that tells your right there that you're "undergunned" for your room size. By quite a margin. I learned the hard way and had to change out the system. Buying right the first time is always cheaper.
All my comments are made based on MY expectations. If high volume means nothing to you, then you will likely be fine. But, it's not only volume that you gain, it's dynamics. At the same volume, when there's crashes and explosions, my old system would make people hold there ears. My current system makes them jump out of the chair! The difference is realism, not volume.
I wish you were closer, you could hear and see mine. I think it would speak for itself. Actually, seeing as how our rooms are so similar in dimension, you might find it worthwhile to make a drive. Being in the space can teach you more than months on the internet. You're certainly welcome to if you'd like. Make a weekend of it.
My response to the above was:
Many thanks for your insight! I do wish that I could visit your theater and see for myself. I like things big like you! I have started buying B-stock AT gear because Dennis Erskine rated only 3 companies that made excellent low-priced speakers (Triad, AT & Ariel(?)). Triad is way more expensive than AT.
AT gives the following guidance for their speakers: http://atlantictechnology.com/defaul...alse&NodeId=96
I am collecting their 'large room (>5,000 cu. ft) gear and have already bought the inwall subs and a pair of surrounds. I think that you want to stick the same brand for timbre matching'. I am in a fix. Already committed part way to AT, but also see your point.