Shure AMS8100 Automatic Microphone Mixer

in good working condition. 

From Shure:

The AMS8100 is designed for numerous applications in sound reinforcement, audio recording, and broadcast. In any speech pickup application where multiple microphones are required, the AMS8100 dramatically improves audio quality. Automatic operation allows an individual talker’s voice to rise above background noise and reverberation to become clearer and more intelligible. The Shure Model AMS8100 is an automatic microphone mixer usingShure’s patent--pending DirectionalIntellimix
circuitry. Directional Intellimix activates only those microphones being addressed, minimizing the poor audio caused by multiple open microphones. The special patented* AMS microphones gate on only for sounds arriving from in front of the microphone within a 120_ “acceptance angle”. Additionally, if a talker’s voice originates within the acceptance angle of more than one AMS microphone, Directional Intellimix will activate only the closest, loudest microphone. Directional Intellimix, however, does not limit the number of open microphones to one; if several talkers speak simultaneously, Directional Intellimix will activate several microphones. The AMS8100 can handle up to eight AMS microphones and two aux--level sources. The AMS8100 microphone inputs work only with Shure AMS microphones. Each microphone input channel has a two-band equalizer. Equalization is useful to reduce unwanted low-frequency audio pickup, as well as to make the different AMS microphones—lavalier, surface-- mount, probe and gooseneck—sound similar in their different applications. Each input channel has three associated logic terminals: Gate Out, Mute In, and Override In. These connections provide for activation of external devices and externalmicrophone control, importantfor specialized installed sound applications. Each mixer channel also has a 1/4-inch phone jack for use as a direct output. This jack can be modified to be a gated channel output or a send/receive insert point. The AMS8100 is capable of being expanded for installations as large as 400 input channels. The AMS8100 is fully link--compatible with Shure’s SCM810 and FP410 automatic mixers. The single-rack-height chassis is idealfor installations with limited rack space. The removable header-type input and output connectors are quick, convenient, and eliminate the time and expense of wiring XLR microphone connectors. The AMS8100 is designedfor 100--120 Vac operation and its line cord contains a standard American 3-pin grounded ac plug. The AMS8100E is designed for 220--240 Vac operation and its line cord contains a CEE 7/7 (“Schuko”) plug. An accessory rack panel adapter to convert the removable block input and output connectors to XLR connectors, and aux connectors to phono jacks is available as the RKC800.