Benefits of acoustic panels

Do acoustic panels really make that big of a difference? Yes. Yes. Yes. But Don't take our word for it according to a post on the http://www.avsforum.com website:

"It's definitely one of the best investments you can make in your theater. I was amazed at the differences that I heard in my space with just a few panels." 

Acoustic Treatment Demonstration - Untreated Room vs Foam vs Acoustic Panels