The CP 64 is a versatile commercial preamplifier designed for use in restaurants, bars, health clubs and offices. The CP 64 is capable of serving two independent Zones. Two gated Paging inputs and four Program inputs are provided. Ports are provided for expansion of Page, Program or Zone signals. Four levels of priority are supported: Priority Page, Non-Priority Page, Priority Program, and Non-Priority Program. The versatility of the CP 64 allows a wide variety of system configurations while providing simple and intuitive controls. Two gated Paging Inputs capable of receiving mic or line level input are provided. Each features independent Mic/Line Pad, Gain Trim, detector Threshold, Zone Assign and Zone Level controls. Internally selectable phantom power is provided for each input. Each Paging input may be summed Pre- or Post- Zone Level control to allow setting Paging Level independent of Zone Level. An internal Paging Priority switch allows a 'master' pager to override non-priority