The feasibility of constructing media with high acoustic transmissivity for all frequencies will be evaluated. Program objectives are(1) to determine theoretically the acoustic velocity profile that gives maximum transmissivity(2) to design flat test panels based on (1)(3) to make test panels and measure the transmissivity vs. frequency for an ultrasonic range of 0.5 MHz to 5 MHz, a range taken as indicative of feasibility.Anticipated Results/Potential Commercial Applications as described by the awardee:Anticipated results will be panels which have maximum acoustic transmissivity for a wide frequency range. Applications are possible as acoustic lenses, speaker covers, hearing aid components, and sonarproof structures.