The PA-EPS600 Extension Main Unit is generally used in the conference system which the quantities of Chairman Units and Delegate Units in one system exceed 60 units. Each extension main unit can support 64 units microphone, and the system can support up to 256 units microphone by increasing more extension main units, and some discussion function conference system can up more than 500 units.

With extension input connectors, and 6 channel 8PIN-DIN sockets convenient for conference microphones connection.