The Bogen Model MCP35A Master Control Panel provides facilities for instantaneous two-way communication and distribution of emergency pages, background music or other program material to speaker-equipped locations. The control panel has two built-in amplifiers. The intercom amplifier, rated at 20 watts, features a frequency response shaped for maximum intelligibility. The 35-watt program amplifier ensures that program material and/or emergency announcements are clearly heard and easily understood. Front panel step-by-step instructions and color-coded lines make the MCP35A easy to operate. Distribution of program material is accomplished by simple push-button program selection, following the color-coded guidelines. Emergency announcements to all locations take precedence over program distribution and are accomplished with a single (EMERGENCY PAGE) push button selection. Inputs are provided for two Lo-Z balanced microphones, a Hi-Z unbalanced AUX program source (CD player/tuner, etc.), and telephone paging accessories. Booster amplifier IN/OUT connections are also provided. Provision are included to supply phantom power to microphones, distribute time signals to speakers, and make emergency all-call page announcements from telephone or remote microphone. Rear-panelmounted and internal controls are provided to adjust the gain level of individual inputs and to enable/disable system features. A console microphone (built-in) is normally used to communicate with a station over the intercom channel, to send emergency page announcements to all stations, and may be used as program MIC 1. It is easily defeated for external microphone applications. A built-in speaker is used for intercom communication and for monitoring program material before distribution. Provision is included to mute the speaker when the MIC 1 switch is pressed. The MCP35A uses room selector panels to direct intercom or program to selected staff stations. Panels are provided with switches to place each room on a program channel, intercom channel, or off. Each switch position on the panel includes an LED call-in annunciator. When a staff station is called from the control panel, a supervisory tone alerts the staff member to the call. The tone repeats at regular intervals to prevent unauthorized monitoring. Calls from staff stations may be initiated through call-in switches and can include privacy control to positively prevent monitoring. Provision is included for voice call-in from stations equipped with voice call-in switches