How it works
AEM's P139-HD combines configurable panels and centralized routers to mix and route radio, receiver, headset, intercom, alert and recorder audio. The G13000RL low-impedance option announced in March 2026 provides eight headset ports, ten transceivers/eighteen receive-only channels, twelve additional keylines and a 25 W speaker driver. Its installation supplement identifies 5-ohm microphone and 8-ohm earphone interfaces and a dedicated 28 VDC supply on the same bus as the associated emergency COM for emergency operation. The January 2026 supplement states no STC or TSO at that time; approval of another radio or router configuration cannot establish this installation's approval.