amplification equipment complex plus remote output station equipment that drives headphones and speakers. The system is intended for use to distribute audio entertainment programs and paging announcements to speakers at group listening stations and to headphone jacks for use at personal listening stations.

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A-A-50601

and shall illuminate whenever muting is in effect.

15. Attenuation control. The system shall include an attenuation control that enables the simultaneous attenuation of all output channels. The attenuation level shall be 13 � 3 decibel (dB).

16. Output monitoring. The audio entertainment distribution system shall include an output level meter and a headphone output jack. The headphone output shall have an impedance compatible with 400-ohm headsets. All of the audio program outputs shall be selectable available for driving the output level meter and headphone output jack.

17. Overload protection. All input and output electronics shall be overload protected so that no equipment will be damaged if input or output rated levels are exceeded.

18. Power. The equipment shall be nominally powered by 115 volts, 60 Hz, single phase electrical power. An ac input on/off power switch shall be provided. Input power shall be fused.

19. Personal listening station equipment sets. Personal listening station (PLS) equipment sets shall include:

(a) One stereo channel selector on/off switch.

(b) One standard subminiature stereo headphone jack (EIA 331).

The PLS channel selector switch shall enable user to select any one of the system channel outputs and shall be labeled as to function. The PLS volume control shall cover a range of from 0 to 100 percent of full output power wherein full power supplied to the PLS shall be 50 mW and the headphone impedence will be 3000 ohms. The number of PLS equipment sets required shall be as specified in the contract or order.

20. Group listening station equipment sets. Group listening station (GLS) equipment sets shall include:

(a) One output channel selector switch.

(b) One volume level control.

(d) One headphone volume control.

(e) Speaker on/off switch

The GLS charnel selector switch shall enable user to select any one of the system channel outputs and shall be labeled as to function. The GLS volume control shall cover a range of from 0 to 100 percent of full output power wherein full power supplied to the PLS shall be 150 watts per channel at a 70 V line level. The number of GLS equipment sets required shall be as specified in the contractor order.