18KHz. Operating Temperature level: -10 ～ 50 ℃. Measurements: 440x300x44mm. Area Combining Digital Amplifier NBS-2301 Power Supply ： AC 220V, 50Hz. Power ： 130W ， 260W ， 360W ， 550W ， 700W. Communication Procedure ： HTTP, TCP/IP, UDP, ARP, ICMP, IGMP. Signal-to-Noise Proportion ：. Mic Input 01: ≥ 65dB,. Mic https://martinlgdgq.blog-mall.com/30551316/spon-communications-leading-the-way-in-innovative-ip-pa-system-designs