Speakers for large open room

Your musical tastes, set-up and room appear to be ideal for some beautiful vintage Klipsch K-horns and SET tube amplification...

Damn...Great sound at a reasonable price. You bastard!

my living room is almost exactly like your room. It's been really frustrating to the point I finally built a dedicated room in my basement for my primary system. I have tried many speakers in the LR though. You want something that produces deep bass and plenty of it. I also found placing them on the long wall works best for me - with the backs to the window.

I'm using vintage Infinity Monitor IIa's there now. They're set about 2' out from the window and 10' apart. The listening position is a sofa against the other wall. These speakers are flat to 22Hz, and do nicely in this configuration - though not as nicely as they do in a more optimal room. Other speakers I've tried in that room sounded like a transitor radio.

Even before I saw that you have b&w's, I was going to suggest B&W Matrix 801 SIII's. That's if you have the room for such gigantic heavy speakers, & if you want to go to a more powerful amp(s). Theil 3.6's are another suggestion. Also B&W Matrix 802 SIII's, but you'll need more power for either of those as well.....

I had the Matrix 802's in a smaller room, with 240 wpc. Gorgeous on Orchestral music. Merlin VSM's would be nice if you want speakers that don't need a lot of power, but I'm not sure how they'd work in that size room.

For that kind of money you could get stacked Altec Model 19's. :o) Those should fill the room nicely.

Avantgarde! Duo or if budget allows Trio