The AA200PHD 6-input channel mixer amplifier is for distributed business paging and background music, speech privacy systems, and where music on hold is needed. With four balanced microphone/line inputs and two stereo summing line inputs, the AA200PHD will accommodate a variety of input sources including paging microphones, media players, and digital music receivers.

The AA200PHD includes a patent pending automatic system test, the Push Here Diagnostic® (PHD). The PHD button is designed to check the connected speaker lines for wiring and impedance errors. This test can be activated once all speakers are connected and the circuit automatically verifies that the attached speakers' tap settings do not exceed the amplifier's rated power, no speakers are mistakenly tapped at 8O, and the speaker wire is free from shorts.