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://surroundsoundsystem46654.azzablog.com/30126016/discover-the-benefits-of-using-an-ip-speaker-for-clearer-announcements