Debate: Why Can’t They Get the Sound Right?

Has anybody else noticed that the majority of the debates have had awful sound quality? Tonight’s is no different, with a constant, hollow echo sound whenever anybody speaks. It’s especially bad when they go out into the audience. I may be wrong, but I don’t remember this being an issue at the last Democratic debate on CNN, though it was an issue with the YouTube debates. You’d think that after more than a dozen of these things, they could have figured it out.