18KHz. Operating Temperature: -20 ～ 50 ℃. Dimensions: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Interaction Protocol: TCP/IP, UDP, SIP. Signal-to-Noise Ratio: > 90dB. Regularity Action: 45Hz https://opticalnearme35322.newbigblog.com/35942760/choosing-the-right-ip-speaker-key-includes-to-take-into-consideration