18KHz. Running Temperature level: -10 ～ 50 ℃. Measurements: 440x300x44mm. Zone Mixing Digital Amplifier NBS-2301 Power Supply ： A/C 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Communication Protocol ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Ratio ：. Mic Input 01: ≥ 65dB,. Mic https://surroundsoundsystem46654.azzablog.com/30126016/discover-the-benefits-of-using-an-ip-speaker-for-clearer-announcements