18KHz. Operating Temperature: -20 ～ 50 ℃. Measurements: 193x151.5 x292mm. Network Column Speaker GEN-6191A03 Power Supply: DC24V/1A or POE. Communication Method: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 90dB. Frequency Feedback: 45Hz https://andreofxla.timeblog.net/65830926/why-an-ip-paging-system-is-essential-for-modern-businesses