Sennheiser SL HANDHELD DW-4-US Wireless Handheld Microphone - 505902

Spec Sheet (PDF)

Product Overview

The Sennheiser SL HANDHELD DW-4-US is a professional digital wireless handheld microphone purpose-built for speech-critical applications such as corporate presentations, academic lectures, and houses of worship. Operating on the license-free 1.9 GHz DECT spectrum with 256-bit AES encryption, it delivers broadcast-grade audio clarity with zero setup complexity. Its speech-optimized condenser capsule and automatic frequency management make it an ideal choice for AV integrators and presentation professionals who need reliable, high-intelligibility wireless performance right out of the box.

Product Description

The SL HANDHELD DW-4-US is part of Sennheiser's SpeechLine Digital Wireless family, a system engineered from the ground up for spoken-word applications. Unlike general-purpose wireless systems, the SpeechLine platform prioritizes intelligibility, reliability, and simplicity — making it ideal for environments where audio failure is not an option. The handheld transmitter pairs with the SL Multi-Channel Receiver DW (sold separately) and leverages bidirectional communication so that all frequency coordination and link setup happens automatically without touching the transmitter itself.

At the heart of the SL HANDHELD DW-4-US is a speech-optimized condenser microphone capsule that captures the natural character of the human voice with clarity and presence. The microphone operates in the 1,920–1,930 MHz DECT band, which is license-free in the United States, eliminating frequency coordination headaches that plague traditional UHF wireless systems. AES 256-bit encryption is standard, providing enterprise-grade security for confidential meetings, government sessions, and sensitive presentations.

The transmitter's ergonomic design features a clearly positioned mute slider, an LC display showing link name, battery status, and reception quality, and a rechargeable Li-Ion battery pack that delivers up to 15 hours of operation on a single charge — enough for full-day conferences. The battery pack uses external charging contacts compatible with the optional CHG 2 charger, and a USB socket is also provided for flexible charging. Audio is captured and transmitted at 24-bit/48 kHz for professional digital fidelity with a dynamic range exceeding 120 dB(A) and a signal-to-noise ratio greater than 90 dB(A).

Key Features

• License-Free 1.9 GHz DECT Operation — Operates in the 1,920–1,930 MHz band; no frequency coordination or licensing required in the US.
• Speech-Optimized Condenser Capsule — Tuned specifically for vocal clarity and intelligibility in presentation and lecture environments.
• AES 256-Bit Encryption — Enterprise-grade security for government, corporate, and confidential-meeting environments.
• Automatic Frequency & Interference Management — System self-coordinates channels; no manual RF setup needed at the transmitter.
• Bidirectional Transmitter–Receiver Communication — All settings propagate from receiver to transmitter automatically for zero-touch operation.
• Up to 15 Hours Battery Life — Rechargeable Li-Ion Accupack supports full-day operation; AA batteries provide up to 10 hours as backup.
• 24-Bit / 48 kHz Digital Audio — Professional sampling resolution with >120 dB(A) dynamic range and <0.1% THD.
• Signal-to-Noise Ratio >90 dB(A) — Exceptionally low noise floor for clean, natural speech reproduction.
• LC Display with Link & Battery Status — At-a-glance transmitter feedback for presenters and operators.
• Ergonomic Mute Slider — Conveniently positioned for natural, confident muting without interrupting the presentation flow.
• CHG 2 Compatible Charging Contacts — Drop-in charging via optional charger; USB socket also supported for flexible power management.
• Remote Controllable — Full remote management capability via compatible Sennheiser receiver for centralized AV control.

Typical Applications

• Corporate boardrooms and executive presentation suites
• University lecture halls and auditoriums
• Houses of worship — pastors, worship leaders, and guest speakers
• Government chambers and council meeting rooms
• Conference centers and convention hall breakout rooms
• Training facilities and professional development seminars
• Podium and panel discussion setups

Technical Specifications

Frequently Asked Questions

Q: Does the SL HANDHELD DW-4-US require a frequency license in the United States?

No. The SpeechLine Digital Wireless system operates in the 1.9 GHz DECT band (1,920–1,930 MHz), which is license-free in the US. There is no need to apply for FCC frequency coordination or pay licensing fees.

Q: What receiver is compatible with this handheld microphone?

The SL HANDHELD DW-4-US is designed to work with the Sennheiser SL Multi-Channel Receiver DW series. The receiver and transmitter communicate bidirectionally, enabling automatic setup and remote control.

Q: Can I use regular AA batteries if the rechargeable pack runs out?

Yes. The transmitter accepts AA batteries as an alternative power source, providing up to 10 hours of operation — a useful backup during long events.

Q: How long does the rechargeable battery last per charge?

The Li-Ion Accupack delivers approximately 15 hours of continuous operation, making it suitable for full-day conferences, multi-session worship services, or all-day training events.

Q: Is this microphone suitable for singing or music performance?

The SL HANDHELD DW-4-US is specifically optimized for speech intelligibility and is best suited to presentation, lecture, and spoken-word applications. For live music performance, Sennheiser's evolution wireless or Digital 9000 series would be more appropriate.

Q: Is the audio transmission encrypted?

Yes. All audio is protected with AES 256-bit encryption, the same standard used in enterprise IT security. This makes the system appropriate for government, legal, and confidential corporate meeting environments.

Q: What charging options are available?

The transmitter supports two charging methods: external charging contacts compatible with the Sennheiser CHG 2 charger for drop-in convenience, and a USB socket for flexible charging from any USB power source.

Q: Can I remotely adjust settings on the transmitter from the receiver?

Yes. The bidirectional communication link between the SL HANDHELD DW-4-US and the SL receiver allows remote control of transmitter settings from the receiver, which is especially useful in fixed-installation or rack-mounted AV setups.