An acoustical fix for Denver’s Boettcher Hall is going to cost more than $40 million. Last year the director of Denver’s Division of Theatres and Arenas, estimated the project’s price tag at $25 million to $40 million. But he now says he believes that “when the firm completes the second half of its study later this spring, it will recommend gutting Boettcher and essentially building a new, reconfigured concert hall within its existing walls.”