Introducing ResounderThe Resounder blends in seamlessly with clear acrylic barriers and redirects sound waves so you and your customers can hear and be heard more clearly. For more information, click here. An acrylic barrier alone blocks high frequency sounds and inhibits those on either side from hearing consonants, making speech intelligibility difficult. The Resounder works by redirecting high frequency sounds, making consonants easier to hear, which is critical for making speech intelligible.