Pro Intercom MS300 Master StationFor those who do not require all the capabilities of the MS301, Pro Intercom offers the MS300. It has all the features and qualities of the MS301, without the IFB, Paging and Auxiliary Audio functions, resulting in considerable cost savings. Each circuit has a characteristic impedance of 200 ohms at audio frequencies, allowing many beltpacks to be connected together without significantly changing the circuit performance. The termination networks are