Here at Soundproofing America, Inc. we like to give our customers the knowledge they need. While other companies will gladly charge you for books on soundproofing that are clearly out in public domain, we don’t believe that you should have to pay for this knowledge. Our book is the same as you will find on other websites (and pay up to $10.00 each for).
So download it for free and learn more. Knowledge is Power!
Dr. Bob and the Soundproofing America, Inc. Team