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Acoustic Spectral Curves & Speech IntelligibilityPackage (STI-PA).
Installed in SoundPro SE and DL Models with 1/1 and 1/3 Octave Filter only. Includes OPTION-1 Firmware installed in SoundPro SE and DL 1/1 and 1/3Models only, plus calibrated STI-PA test tones and a portable device.