18KHz. Running Temperature: -10 ～ 50 ℃. Measurements: 440x300x44mm. Zone Combining Digital Amplifier NBS-2301 Power Supply ： A/C 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Interaction Procedure ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Ratio ：. Mic Input 01: ≥ 65dB,. Mic Input https://myleswbbde.aioblogs.com/83501200/selecting-the-right-ip-speaker-trick-features-to-think-about