- Sirus Quad H 823 MKII - professional dynamic UHF handheld transmitter; compatible with Sirus Quad R 823 # 502806; polar pattern; cardioid; synchronisation with receiver via Infra-Red; frequency band: 823-832 and 863-865 MHz; frequency range: 40 Hz - 18 kHz; THD: EUR 77.00 - See more - Buy online