The Proudfoot Company pioneered noise control in concrete by introducing its SOUNDBLOX Acoustical Masonry Units (ACMUs) in 1965. SOUNDBLOX ACMUs reduce noise levels and prevent sound transmission far better than standard CMUs. Appropriate for indoor and outdoor use, SOUNDBLOX are ideal for school gymnasiums, auditoriums, classrooms, wastewater treatment plants, chiller enclosures, highway/railway noise screens, maintenance facilities and other public work applications.