18KHz. Operating Temperature level: -20 ～ 50 ℃. Measurements: 193x151.5 x292mm. Network Column Audio Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Communication Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 90dB. Frequency Reaction: 45Hz https://deankgdza.thelateblog.com/30516677/reasons-why-an-ip-paging-system-is-crucial-for-modern-organizations