Sennheiser EW-DX SK (Q1-9)

On a live stage, a presenter clips the EW-DX SK to their belt, connects a lavalier microphone, and moves freely while their voice remains clear and uninterrupted. This digital wireless bodypack transmitter from Sennheiser’s Evolution Wireless Digital series operates in the Q1-9 frequency range (470.2 - 526 MHz), delivering professional audio with ultra-low latency and robust encryption.

Key specifications

• Digital transmission with DQPSK modulation for reliable signal integrity
• Wide audio frequency response: 20 Hz - 20 kHz (-3 dB)
• Exceptional dynamic range of 134 dB
• Ultra-low latency of 1.9 ms for real-time monitoring
• AES 256 encryption for secure audio transmission
• Input: 3.5 mm locking jack, compatible with lavalier and headset microphones
• Input impedance: 1 MΩ; maximum input level: 2.2 V RMS
• RF output power: 10 mW ERP
• Powered by 2x AA batteries (up to 8 hours) or BA 70 rechargeable battery pack (up to 12 hours)
• E-Ink display for clear status indication even in bright light
• Bluetooth Low Energy for remote control and setup via Sennheiser Smart Assist App
• Rugged metal housing for demanding stage use

Why choose it

The EW-DX SK combines broadcast-quality audio with intuitive operation. Its digital architecture eliminates intermodulation issues, allowing more channels to operate simultaneously in crowded RF environments. The low latency ensures that performers hear themselves in perfect sync, while the AES 256 encryption protects sensitive content from unauthorized listening. The E-Ink display provides at-a-glance battery and connection status, and the BLE app enables quick frequency coordination and monitoring from a smartphone.

Ideal use cases

• Live stage performances for singers, presenters, and instrumentalists
• Broadcast and ENG (electronic news gathering) applications
• Houses of worship requiring reliable wireless audio
• Corporate events and conference presentations
• Theater productions with multiple wireless channels

Good to know

The transmitter is part of the EW-DX series, which offers scalable system solutions. It is compatible with EW-DX receivers and can be integrated into existing Sennheiser wireless ecosystems. The Q1-9 band is suitable for use in many regions; always check local frequency regulations before operation. For extended runtime, the optional BA 70 rechargeable battery pack can be charged via compatible charging cradles without removing it from the transmitter.