20KHz. Operating Temperature level: -10 ～ 55 ℃. Measurements: 126x66x27mm. Network Digital Amplifier XC-9508P Power Supply: AC100V ～ 240V, 50/60Hz. Power: 130W, 260W, 360W, 500W. Communication Procedure: TCP/IP, UDP, SIP. Signal-to-Noise Proportion: > 80dB. Frequency Feedback: 60Hz https://griffinhdysl.onesmablog.com/spon-communications-blazing-a-trail-in-ingenious-ip-pa-system-designs-70384636