AtlasIED AA400PHD 6-Input Channel, 400W Mixer Amplifier with Automatic System Test (PHD)

Deliver dependable paging, background music (BGM) and speech privacy across campuses and commercial sites with the AtlasIED AA400PHD pro mixer amplifier. Designed for AV integrators and security teams, this 400W mixer amplifier supports six inputs—four mic/line (with optional phantom power) and two stereo line—so you can connect paging mics, media players and music-on-hold sources with ease. The built-in Push Here Diagnostic (PHD) automated system test checks loudspeaker wiring and tap settings, cutting commissioning time and preventing speaker overloads. With selectable 25V, 70.7V or 4Ω outputs, remote input selection and remote level control up to 200 feet, the AA400PHD streamlines installation and gives end users simple control. Additional features like Zone 2 mixing, paging-priority mute and preamp in/line out make this unit a flexible solution for retail, education, healthcare, and security/surveillance audio systems that require reliable monitoring and clear voice intelligibility. Backed by AtlasIED quality and a 3-year limited warranty, the AA400PHD is ideal for professional AV and security installations—contact us to request a quote or specify this amplifier for your next project.

• Deliver consistent, room-filling audio for medium-to-large facilities with 400W of reliable amplification
• Reduce installation time and avoid speaker wiring/tap errors with the patent-pending PHD (Push Here Diagnostic) automated system test
• Flexible source integration: six inputs (four mic/line with phantom power option + two stereo line) for paging, media players and MOH
• Built for distributed systems with 25V / 70.7V / 4Ω outputs plus Zone 2 mix and page-mute control for speech privacy and paging priority
• Remote Input Select and Remote Level Control allow user selection and volume adjustment up to 200 ft for convenient wall-plate control
• Expandable signal flow with line output and preamp-in for external processing—ideal for security, monitoring and AV integrators