Millipi we don’t have to the specs for the job are wrong.
This is not our first Rodeo remember the fact that we design Movie Theaters, as well as professional design experience for over 30 years, and the specs for loudspeakers, amplifiers, and room size are all part of the design methodology required for Home Theater.
Many Home Theaters are modeled on paper long before the room is built, acoustical panels go in and the calibration is done.
We have covered the points all before of why the Proac loudspeaker is not the right model for this very large room’s volume, in all of our posts, and by the way we could also supply a set of Proacs to this gentleman as we work with Proac’s US importer.
One glaring obvious point is the Bryston’s 600 watt power output with a speaker whose maximum power handling is 250 watts.
One large peak with the volume turned up a bit, and boom fried woofers.
As we have stated before the chance of us selling the OP is low, he may be half way across the country.
As per the Proacs they are excellent loudspeakers, they are well made, use supeb drivers and do many things really well, Proac is not known howerver, for their ability to play loud and fill up giant rooms.
It is totally possible that the Proac D48 might sound as good or even better than the Leagacy Focus we were recommening however Bill Dudleston designs speakers that can be used as a PA, there was a set of Focus used at one show actually as a PA loudspeaker.
Bill lDuddleston the lead designer of Legacy, ikes displacement, big woofers, 12-15 inch bass drivers, his speakers play loud, handle lots of power, and are electrically efficient, also many models have built in amplifier or passive woofers, add in a sweet sounding Heil tweeter and the option of electronic room control it adds up why we recommend these speakers for this application, they also remind us of the Golden Ear Trition References which we sell and this gentleman also likes.
Do we personally feel that the Legacy are the world's best speakers, that is a much harder question, personally if I won the lottery, a pair of Focal Grande Utopia EVO III or a set of the 400k Kharma references with the four Acuton Diamond midranges would be in the Living Room way faster than almost any loudspeaker.
Our recommendation are sound and any loudspeaker that fits the criteria we have listed several times in this thread would work.
We also mentioned D2 Girls JBLs would work well, a large set of Avante Gardes, a set of big Klipsch horns, a giant set of Willsons, Maxxs, a giant set of Focals would also be canidates.
Unless the OP has a preamp that can effectively roll off the bass frequencies to the main louspeakers and then integrate a set of subwoofers any similar loudspeaker with limited efficiency, smaller woofers, that can not handle gobs of power is not going to work.
We have repaired many loudspeakers that were damaged in this kind of enviornment, you must remember that a very large room has totally different requirements than a room that is 20 by 20 or 20 by 30, and the size of the ceiling makes a huge difference in room volume.
Dave and Troy
Audio Doctor