ASL’s solution was to provide ASL’s M400 amplifiers, mounted in a V400 mainframe, which use the company’s unique class-D adaptive technology. Due to the critical nature of the site, a ‘confidence tone’ is broadcast by the VAR routers at 15-second intervals, to reassure personnel on site that the evacuation system is functioning correctly. If third party sensors are activiated, either manually or automatically, a distinct warning tone is broad

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