Sound Control Section Closeup (IMAGE) Duke University Caption The spacing between the rows and the amount that each individual column is filled in work together to perfectly control the transmission and reflection of a specific frequency of sound as it passes through. Credit Junfei Li Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.