Aren the ANSI standards sufficient for establishing good acoustics?
Absolutely not. The ANSI (American National Standards Institute) Standards regarding classroom acoustics completely ignore critical factors contributing to poor SNRs (Signal-to-Noise Ratio) which negatively affects every child’s ability to hear in almost every “real world” classroom. See the Poor Acoustics page for more details on SNR. ANSI Standard Scope of Practice 1.1.2 acoustical performance criteria are specified in this standard by limits on maximum one-hour a-weighted and c-weighted background noise levels and limits on maximum reverberation times. An objective of these performance criteria is to achieve a level of speech that is sufficiently high relative to the background noise level for listeners throughout the classroom or learning space. However, a requirement for the relative difference between speech levels and levels of background noise, usually referred to as the signal-to-noise ratio, is not within the scope of this standard. 1.1.4 this standard does not apply to noise
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