4-Input, 50-Watt Mixer Amplifier with Automatic System Test (PHD)

  • Rack Kit Sold Separately
  • UL Listed
  • 70V / 100V Operation
  • Fault Reporting
  • Remote Level

    The AA50PHD is a four input channel mixer amplifier designed for distributed business paging and background music (BGM) systems, small to medium speech privacy systems, and in applications where music on hold (MOH) plus paging is required. With one microphone/line input and three stereo line inputs, the AA50PHD will accommodate a variety of input sources including paging microphones, media players, and digital music receivers. The AA50PHD includes a patent pending automatic system test, the Push Here Diagnostic (PHD).

    What Sets the AAPHD Series Apart?

    The PHD button is designed to check the connected loudspeaker lines for wiring and impedance errors. This test can be activated once all loudspeakers are connected and the circuit automatically verifies that the attached loudspeakers' tap settings do not exceed the amplifier's rated power, no loudspeakers are mistakenly tapped at 8Ω, and the loudspeaker wire is free from shorts.

    AAPHD Diagnostics

    The unit also incorporates a Remote Input Selection and Remote Level Control feature that allows the integrator to use a remote wall plate (AtlasIED model WPD-RISRL) and allow the user to select the input and adjust the volume from that wall plate up to 200 feet from the amplifier.


    The AA50PHD provides 50-watts output power into 25V, 70.7V, or 4Ω loudspeaker systems. Rear panel DIP switch allows for creation of Zone 2 output using either Input 1, 2, 3 or 4. Unit can also be set-up to mute Inputs 2, 3, and 4 based on signal from Input 1 for paging applications where other input sources need to be muted during a page. Input 1 is either Mic or Line input selectable and Phantom Power is an option when using Input 1 Mic input.

    50W into 25V/70.7V and 4Ω Loads
    Rear Mounted DIP Switch Allows Mute Receive for Inputs 2 and 3
    Contact Closure Mute Terminals
    Variable Mute Sensitivity Control for Input 1
    Preamp In for External Processors
    Line Output
    Remote Input Select (RIS)
    Remote Level Control
    Input Assignable Zone 2 Output
    Two Unbalanced, Summing Line Level Inputs
    Balanced Mic/Line/Tel Input w/ Phantom Power
    Automated Diagnostic System Test (Push Here Diagnostic®)
    Frequency Response 50Hz - 15kHz
    Connector Type 4 Position Phoenix 3.5mm Pitch
    Power Output Max. Average Power @ 50Hz-15kHz with .5% THD, 4Ω 50W RMS
    Height 3.66" (93mm)
    Width 8.27" (210mm)
    Depth 10.87" (276mm)
    Weight 10.5ib
    Shipping Weight 12.4lb
    Voltage Compatibility 110V - 120V
    Owners Manual
    ATS004884E AA50PHD Owners Manual (20 pages)
    Data Sheet
    ATS004920 AA50PHD Datasheet (3 pages)
    Application Example
    AAPHD_WPD-RISRL_App (2 pages)
    Installation Sheet
    ATS004912B AAPHD Amplifier Impedance Diagnostic Test Example (2 pages)
    Owners Manual
    AA50PHD Owners Manual (Spanish) (20 pages)