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The acoustical properties, application, and specification of standard and specialty-engineered hollow concrete masonry units (CMU) used in acoustical design are reviewed. CMU can provide sound isolation, sound absorption, or sound diffusion in a variety of spaces, ranging from mechanical equipment rooms to auditoriums., Concrete masonry units (CMU) can be used in architectural design to provide for good sound isolation or absorption. Sealed with gypsum or paint, even better sound insulation qualities can be attained. CMU can be used in a variety of applications, such as in auditoriums or mechanical equipment rooms. The thicker the CMU, the better the sound transmission loss, and by filling in the block cells, an even greater sound isolation can be achieved., For many architects, the concrete masonry unit (CMU) is the material of choice when ease of installation, low cost, and durability are of prime concern. But standard and specialty-engineered CMU [...]