Sennheiser EW‑D SK Base Set Digital Wireless Bodypack System (R4‑9: 552–608 MHz)

The Sennheiser EW‑D SK Base Set R4‑9 is a premium digital wireless system designed for presenters, performers, lecturers, and touring professionals who need powerful yet easy-to‑use audio solutions. With pristine 24‑bit digital audio and a dynamic range of 134 dB, this system captures audio with exceptional clarity and headroom. Its extensive tuning bandwidth, equidistant frequency grid, and scalable channel count ensure interference‑free operation even in complex wireless environments.

Built around a professional-grade rack-mount receiver (EW‑D EM) and a rugged metal-body SK bodypack transmitter, this system delivers flexibility: you can attach lavaliers, headsets, or instrument cables depending on your application. Bluetooth Low Energy connectivity lets you manage and monitor the system through Sennheiser’s Smart Assist mobile app—completely without disrupting your workflow during live events or broadcast productions.

The auto-scan and infrared sync features streamline setup so you can get performance-ready in seconds. From up to 120 feet away, the transmitter pairs automatically with the receiver, and users can deploy up to 90 channels across a 56 MHz band—ideal for multi-performer or staged productions. Options like rechargeable BA 70 battery support (not included) extend runtime to 12 hours, while included AA batteries deliver up to 8 hours.

This base set does not include a microphone, giving you the choice to pair it with your preferred lavalier, headset, or instrument mic. Its traditional G3/G4 backward compatibility ensures seamless integration into existing systems. Whether you’re running corporate presentations, theatrical shows, or flexible touring setups, the EW‑D SK Base Set R4‑9 delivers pro-level audio performance and user-friendly scalability.