The Telex Audiocom EMS-4001 is a dedicated four-channel expansion station designed to extend the communication capacity of a wired Telex Audiocom intercom system, such as the MS-4001 base station. It functions as a remote user interface, providing four additional, fully independent party-line channels that operate over a single Cat5e or proprietary multi-conductor cable connection to the main unit. This design allows production teams to decentralize their communication points without investing in additional central processing hardware, making it an efficient and cost-effective solution for expanding coverage in broadcast control rooms, live sound environments, theatrical stages, and corporate AV installations. The station delivers full-duplex, hands-free communication on all channels simultaneously, ensuring that users can both speak and listen without interrupting the audio flow.

Engineered for straightforward integration, the EMS-4001 maintains the core audio quality and functionality of the main station. Each of its four channels features a dedicated volume control and a four-segment LED level meter for precise audio monitoring and adjustment. The unit includes individual microphone mute buttons for each channel, allowing operators to selectively control their participation in different conversations. Audio performance is characterized by clear, natural voice reproduction with effective noise rejection, facilitated by balanced audio circuits that minimize interference over extended cable runs. The station is typically powered directly from the main base unit via the same connection cable, eliminating the need for a separate local power supply and simplifying installation.

The physical design is robust and rack-mountable, featuring a standard 1U form factor with a metal chassis built for durability in professional environments. Its user interface is laid out intuitively, with backlit buttons and clear labeling to facilitate operation in low-light conditions. By adding the EMS-4001 to an existing Audiocom system, integrators can effectively double or further multiply the number of available user positions, creating a scalable and flexible communication network tailored to the specific needs of a production or venue. This expansion capability makes it an indispensable tool for growing intercom systems where reliable, high-quality wired communication is essential for coordinated workflow among multiple technical teams.