The CP-31 is a switching / paging controller aimed at commercial establishments with a compact RU1 size and low cost. One stereo line input can be separately assigned to 2 zones as 2 Mono inputs with separate level control or 1 Stereo input via RCA jacks. The paging input features a balanced Euroblock input connector, Mic/Line switch, Trim control, switchable Hi/Lo filters and page assign ( A, B, A+B or Off). The Zone Output section features Ducker Depth with an On/Off Switch. The CP-31 is also an easy single zone addition to the multi-featured CP-52 and CP-64.