If your room, which is obviously a sonic nightmare and is basically an echo chamber, didn’t work with the Dynes or Sonetto it’ll only get worse with the 705s that lean even brighter. If I was you I’d seriously be looking at some kind of digital room EQ if you can’t do anything to treat that room. Can’t you at least put down an area rug? I’d think even just doing that might improve acoustics quite a bit. Just my $0.02 FWIW, and best of luck with this very challenging situation.
Quoting acoustician Matthew Poes: "A speaker that has controlled dispersion does basically the same thing you’d expect an acoustic panel to do, but it does a better job. And it allows you to get away with no panels on the wall.”
