The Sennheiser EW-D EM (R4-9) is a single-channel, rack-mountable digital wireless receiver from the flagship EW-DX series, operating in the R4-9 frequency band (552 to 607 MHz). Designed to receive signals from compatible EW-DX handheld or bodypack transmitters, this receiver delivers pristine 24-bit/48 kHz digital audio quality with ultra-low latency, making it ideal for critical listening applications in broadcast, live sound, and installed environments. It incorporates Intelligent Antenna Diversity, utilizing two antenna inputs and advanced signal processing to ensure the most stable RF link possible, maximizing range and minimizing the risk of dropouts.

The receiver features a clear OLED display for monitoring channel status, RF strength, and audio levels, and provides both analog XLR and digital AES3 outputs for flexible integration into any professional audio workflow. It also supports 128-bit AES encryption for secure transmissions. As a modular 1U unit, it can be used alone or combined with other EW-D receivers in a rack to build a multi-channel system. The EW-D EM (R4-9) represents the cutting edge of wireless technology, offering engineers unparalleled audio fidelity, robust RF performance, and future-proof features in a compact, reliable package.