Sennheiser SL BODYPACK DW-4-US Digital bodypack transmitter, 1.9 GHz, with ew jack plug. Includes (1) BA 30 rechargeable battery and (1) pouch - 505900

Product Overview

The Sennheiser SL Bodypack DW-4-US is a standalone digital wireless bodypack transmitter from the SpeechLine Digital Wireless series, operating license-free on the 1.9 GHz DECT frequency band with DW-4 frequency variant designation for interference avoidance in dense wireless environments. Sold without a microphone, it is designed for system integrators and AV professionals who wish to pair it with their own lavalier or headset microphone via the lockable 3.5 mm EW jack plug input. It ships complete with a BA 30 rechargeable Li-Ion battery and a protective carrying pouch. Operating with the SL MCR receiver family, it delivers secure, automatic, cable-free audio transmission for presentations, lectures, and corporate AV applications.

Product Description

SpeechLine Digital Wireless is Sennheiser's professional-grade 1.9 GHz DECT system built specifically for speech intelligibility in demanding installed-sound and presentation environments. The SL Bodypack DW-4-US is the transmitter half of this system — a compact, robust bodypack that clips to a belt or clothing and connects to virtually any lavalier or headset microphone with a standard 3.5 mm connector. The DW-4 suffix identifies it as one of four available DECT frequency variants (DW-1 through DW-4), each occupying a distinct frequency channel within the 1.9 GHz band. Using multiple variants simultaneously allows facilities with dense wireless deployments to reduce the risk of inter-system interference — an important consideration in conference centres, houses of worship, and multi-room AV installations. Because DECT operates in a dedicated spectrum separate from consumer Wi-Fi and 2.4 GHz devices, the SpeechLine system benefits from inherently cleaner RF coexistence than many competing wireless systems. Bi-directional communication between the transmitter and the SL MCR receiver means the receiver automatically handles frequency coordination and system settings — no manual channel assignment is required on the bodypack itself. The integrated LC display shows link name, battery charge status, and signal quality at a glance, while the easily accessible mute slider lets presenters silence the microphone discreetly. 256-bit AES encryption secures the audio link against eavesdropping — essential in boardroom, legal, and government environments. The included BA 30 Li-Ion battery delivers up to 15 hours of continuous operation per charge, with external charging contacts allowing in-situ charging via the optional CHG 2 charger without removing the battery. The EW jack plug input (lockable 3.5 mm) accepts a wide range of compatible Sennheiser and third-party microphones, giving integrators maximum flexibility in microphone selection. A protective carrying pouch is included for transport and storage.

Key Features

• 1.9 GHz DECT Operation — License-free, dedicated spectrum with inherent separation from Wi-Fi and Bluetooth interference sources.
• DW-4 Frequency Variant — One of four DECT channels for deploying multiple SpeechLine systems in the same space without inter-system interference.
• Lockable 3.5 mm EW Jack Input — Accepts a wide range of lavalier and headset microphones; locking mechanism prevents accidental disconnection.
• Automatic Frequency Management — Bi-directional link with SL MCR receiver handles all channel coordination automatically.
• 256-Bit AES Encryption — End-to-end audio security for confidential boardroom, legal, and government presentations.
• Up to 15 Hours Battery Life — BA 30 Li-Ion battery included; external charging contacts support in-situ charging via CHG 2.
• LC Status Display — Shows link name, battery level, and reception quality in real time.
• Easy-Access Mute Slider — Discreet, accessible microphone muting for presenters.
• Compact and Robust Form Factor — Designed for reliable daily use in installed AV environments.
• Includes BA 30 Battery and Carrying Pouch — Ready to deploy out of the box alongside a compatible SL MCR receiver.

Typical Applications

• Corporate boardroom and conference room presentations
• University lecture halls and educational AV systems
• Houses of worship with installed wireless audio
• Government and legal facilities requiring encrypted audio
• Multi-room AV installations with dense wireless environments (using mixed DW variants)
• Hospitality and event spaces requiring reliable speech wireless
• System integrators building SpeechLine Digital Wireless deployments

Technical Specifications

Frequently Asked Questions

Q: Does the SL Bodypack DW-4-US include a microphone?

No. This is a standalone transmitter sold without a microphone. It accepts any compatible lavalier or headset microphone with a 3.5 mm connector via its lockable EW jack input. Common pairings include Sennheiser's SL Headmic 1 and MKE 1 series.

Q: What receiver does this bodypack work with?

The SL Bodypack DW-4-US is designed to operate with Sennheiser SL MCR series receivers (e.g., SL MCR 4 DW). It will not function as a standalone transmitter without a compatible SL MCR receiver.

Q: What does the DW-4 designation mean?

DW-4 identifies the DECT frequency variant — one of four available channels (DW-1, DW-2, DW-3, DW-4) in the 1.9 GHz band. Using different variants for multiple simultaneous systems reduces the potential for inter-system interference in dense wireless environments.

Q: Is a license required to operate this transmitter in the United States?

No. The 1.9 GHz DECT band used by the SpeechLine system is license-free in the United States, which is why the model designator includes -US. Always confirm local regulatory compliance for installations outside the US.

Q: How long does the BA 30 battery last?

The included BA 30 Li-Ion rechargeable battery provides up to 15 hours of continuous operation per charge under typical conditions.

Q: How is the battery charged?

The BA 30 battery has external charging contacts that allow it to be charged while still inside the bodypack using the optional Sennheiser CHG 2 charger. It also has a USB socket for charging. Contact Creation Networks to add a CHG 2 to your order.

Q: Is the audio link encrypted?

Yes. The SpeechLine Digital Wireless system uses 256-bit AES encryption to secure the audio transmission, making it suitable for sensitive environments including boardrooms, legal proceedings, and government facilities.

Q: Where can I purchase a compatible SL MCR receiver or microphone to complete the system?

Creation Networks carries the full SpeechLine Digital Wireless ecosystem. Visit creationnetworks.net or contact our team to spec out a complete system with the right receiver, microphone, and charging solution.