Hi,
I have owned the Eidolon and heard the BW several times. To me there is no comparison. The Avalon has a capacity to render detail and nuance that the BW lacks. And the soundstage is incredible. However they do not have a very strong bass.
Be careful with amplification. The Krell should work well but I never heard them with a big valve amp, like the Premier 140.
I do not know the Proac.
Good luck
I have owned the Eidolon and heard the BW several times. To me there is no comparison. The Avalon has a capacity to render detail and nuance that the BW lacks. And the soundstage is incredible. However they do not have a very strong bass.
Be careful with amplification. The Krell should work well but I never heard them with a big valve amp, like the Premier 140.
I do not know the Proac.
Good luck