Marc Shulgold has some misgivings about Denver’s new opera house. It’s a cold space, for one. “Acoustically, the Ellie is quite nice. But then, great pains were taken to create a natural, unamplified space for singers. Still, this was not the vibrant, room-filling sound we had expected. From downstairs, the singing and talking during Carmen often faded away if the performers didn’t project out to the house or put some oomph in their delivery.”