I’m not an expert, so all I can offer is my own ideas. Perhaps you won’t mind if I enjoy the conversation.
My movie room is similar volume to yours, little bit different dimensions, 14x25x9 ft. Two walls are nearly completely windows, glass door to the porch on a third wall, and two openings to other rooms on the fourth wall. Not an acoustically perfect room by any means. I am running JBL 4349 as left & right in that room in a 7.1 set up. Listening to two-channel stereo music, I found the bass quite weak for my taste, until an 18-in sub was added. Apart from that, the output is quite adequate.
I expect Kef makes something that will fill your room to your liking. I’ve heard Muon in a very large room, and it was deafening.
High output Genelec, Neumann and JBL will fill the bill sonically, but maybe not aesthetically. The frequency response of JBL’s for whatever reason are more lumpy than flat (in general) right out of the box. If memory serves, M2 and 4367 are exceptions to this. I haven’t seen spins for Everest. They are very large and heavy, so it may be no one but the manufacturer will ever measure them. Fortunately, for JBL, you can usually find anechoic measurements to apply corrective EQ, but this adds complexity and is inconvenient. I think it’s interesting that their designer, Greg Timbers, has them in his home, considerably modified from their stock condition. There’s a video interview floating around the internet, if you want to check it out.
I would discourage random experimentation with the likes of Tannoy Westmin$ter. I got a pair of Definition DC 10A because they were $7,000 used for speakers that retailed at $16,000, thinking I could recover my cost if they didn’t work out. In the end, they didn’t work out well, and new ones were on close out a couple years ago for $2,000 a pair brand spanking new (!!). So, you can imagine the loss I’d take trying to sell them now. That they were nearly giving them away like this is telling about how poor the design is. These (and Westminster) are based on very old designs. There are much better ways to do things, and there is no practical reason for their existence these days, imo. They only sell now by attaching fanciful notions of romance and nostalgia to them. Well, they do look good, and the craftsmanship is solid and beautiful. But functionally? Do look elsewhere.
I believe I understand and share your point of view. Stick to what you know to be good. There’s no good reason to gamble on something that doesn’t have published measurements available. I have found
@pierre ’s site
spinorama.org to be quite useful and interesting.
