Audio intelligibility has become a top topic among not only intercom users, but also AHJ's (authority having jurisdiction) across the country. Check out these resources:
~ Audio intelligibility samples
~ The science of audio reproduction
~ Quality of intercom products
~ NEMA SB 1-2014 Quality Informational Guide for Automatic Fire Detection and Alarm Systems
~ NEMA SB 50-2014 Emergency Communications Audio Intelligibility Applications Guide
~ NFPA: Intelligibility of Fire Alarm and Emergency Communication Systems Final Report
~ BICSI: NFPA 72-2010 Fire Alarm Code Mass Notification System Design Overview
Get the information here.
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