SoundPro SE & DL Series with Option-2

The SoundPro SE & DL Models with Option-2 includes all of the Acoustic Spectral Curves and Speech Intelligibility Functions in Option-1 and adds the accessories needed to perform speech intelligibility measurements through public address, fire alarm, and other mass notification systems (MNS). With this option, you will receive a portable CD device, along with the calibrated test signal CD.

Speech Intelligibility can be a subjective assessment by polling listeners but from a regulatory and standards standpoint it must be verified objectively using a proven methodology. There have been a number of these methods developed over the years including using the Speech Transmission Index (STI), the Room Acoustics Speech Transmission Index (RASTI), and now the most prevalent method named Speech Transmission Index for Public Address Systems (STI-PA).

STI-PA was developed through research that included the TNO Research Institute in the Netherlands. The BOSE Corporation in the U.S.A. has obtained a U.S. Patent (6,792,404B2) covering use of this method in a handheld portable analyzer. Quest has obtained a license agreement with BOSE for this patent.