It's a pretty great theatre, and I also love it dearly as is. I don't mind the acoustics generally, but aware that some people moan about it.
I'm not sure there is a really, really great concert hall from an acoustics perspective in London. Back in Manchester I loved the Bridgewater because it was designed to be acoustically good no matter how many people were in the audience. I can't think of anything that modern and carefully thought through, so I tend to look for smaller venues with more "classical" approaches to acoustics (Wigmore, St Martins, and so on). Where do you like?
I'm not sure there is a really, really great concert hall from an acoustics perspective in London. Back in Manchester I loved the Bridgewater because it was designed to be acoustically good no matter how many people were in the audience. I can't think of anything that modern and carefully thought through, so I tend to look for smaller venues with more "classical" approaches to acoustics (Wigmore, St Martins, and so on). Where do you like?