The California Noise Insulation Standards has for the first time imposed STC testing on a broad segment of the building industry. Local officials and builders, its well as consultants, find it increasingly burdensome to implement standard STC (ASTM) field testing because of costs and delays. Inspectors are reluctant to require testing because of the costs and delays, yet there seems to be no easy alternative available. This paper discusses the results of over 100 tests conducted in the Southern California area of party walls with the object of considering whether a screening method for party-wall checks can be used as a viable alternative to the ASTM method in field inspections. The paper will propose a possible technique for adoption as a supplement to ASTM methods currently employed.

01 Apr 1976·The Journal of the Acoustical Society of America

Electroacoustics covering the period up to 1940

Author: Hilliard, John K.

The concept of acoustical and motional impedance had been conceived and applied to the design of transducers several years before the acoustical society was founded in 1928. It seems appropriate at this time to review some of the individuals and their developments which contributed to the advancement of transducers by application of the impedance concept. A. E. Kennelly, G. W. Pierce, and A. G. Webster introduced the terms “motional impedance” and “acoustical impedance.” The word transducer is now a generic term denoting conversion. The work of Wente, Rice, Kellogg, Maxfield, Harrison, Thuras, and others preceding 1930 will be outlined as well as how they used the impedance concept to predict transducer performance providing the basic concepts which others were to use later to extend frequency range and efficiency. In the period between 1930 and 1940 the application of transducer design was expanded to many fields of electroacoustics. Wente, Thuras, Olson, Hilliard, and Klipsch contributed to improvements in sound reproduction for audience and home reproduction.

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