The Case for the Parametric Method of Acoustic Treatment
The topic of architectural acoustics has been documented and carefully studied for more than a century. Historically, most acoustic treatment products and schemes have offered a relatively “broadband” approach in order to reduce reverberation time in a room. While these fundamentals have changed little, treatment materials and techniques have gradually advanced.
Parametric acoustics does not challenge the physics underlying traditional acoustic theory. Rather, it offers a fresh perspective on how the application of new materials can and should be employed.
This thesis expands my T60 Slope Ratio theory by providing methodology, commentary, and examples for specifying acoustic treatments as band-limited tools. The goal of this paper is to demonstrate how one can achieve “Good” to “Optimum” T60SR6 scores in any performance venue. The T60 Slope Ratio is represented symbolically as T60SR6. The calculation delivers a relational score - using the two extreme time values from the six octave centers - between 63 Hz and 2 kHz.
To that end, the next level of architectural acoustic refinement is proposed: PMAT - the Parametric Method of Acoustic Treatment. While the best practitioner’s in architectural acoustics already understand, and may implement similar principles, the PMAT concepts are not widely considered or applied. Click below to download.