18KHz. Running Temperature: -10 ～ 50 ℃. Dimensions: 440x300x44mm. Zone Mixing Digital Amplifier NBS-2301 Power Supply ： AC 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Communication Protocol ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Proportion ：. Mic Input 01: ≥ 65dB,. Mic Input https://eyeglasses-near-me35422.blog4youth.com/30561923/discover-the-conveniences-of-using-an-ip-speaker-for-clearer-announcements