18KHz. Running 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. Regularity Action: 45Hz https://speakers72669.thekatyblog.com/29201985/picking-the-right-ip-speaker-trick-includes-to-think-about