Purpose
To organize the reading of an environment’s Sound Performance in relation to its specified intent. IPS means Sound Performance Index, not Sound Pressure Index.
Matrix inputs
Sound level and exposure time where applicable; context and activity; comfort and conversability; operations; relevant technical and legal requirements; and adherence to the project specification.
Operational states
Green: within the defined specification. Yellow: deviation requiring investigation and adjustment. Red: outside defined parameters or with possible non-compliance, requiring priority response and, where applicable, specialist assessment.
Limits
The states do not support commercial causal claims, such as a fixed reduction in length of stay for a given dB difference. WHO, ISO, standards and legislation are applied according to their scope; there is no universal table for every environment.
References: ISO 12913-1; WHO — Safe Listening Venues and Events.