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Sennheiser

Sennheiser 505904 SL Headmic Set DW-4-US R

A digital wireless headmic system built for speech clarity in demanding presentation and performance environments.

$1,519.00*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Sennheiser SL Headmic Set DW-4-US R is purpose-built for professional speech reinforcement — the kind of system AV integrators reach for in boardrooms, lecture theaters, and houses of worship where dropout-free audio and fast setup are non-negotiable. Built on Sennheiser's SpeechLine Digital Wireless platform, it operates in the DECT 6.0 frequency range, sidestepping the congested UHF and 2.4 GHz bands that plague traditional wireless in multi-system environments. The automatic frequency management and audio level management features mean the system handles RF and gain decisions autonomously — reducing the cognitive load on engineers managing multiple channels simultaneously.

The included SL Headmic 1 is an omnidirectional head-worn capsule optimized for voice, delivering consistent pickup regardless of minor head movement — the kind of tolerance that matters when presenters turn to reference slides or address an audience at varying angles. The rack-mount receiver integrates cleanly into a standard AV installation, and the system's digital transmission path keeps the noise floor low enough that even soft-spoken presenters come through with presence and clarity. For organizations running consistent speech-focused programming, this system offers Sennheiser's reliability in a configuration that minimizes the variables a live audio engineer has to manage.

Key Features

SL HEADMIC SET DW-4-US R

Specifications

Model
SL Headmic Set DW-4-US R

Pros & Cons

👍 Pros

  • Automatic frequency management means the system locks onto a clean DECT channel without manual RF coordination — a real time-saver on busy event days.
  • DECT 6.0 operation keeps the system out of the congested UHF and 2.4 GHz bands, resulting in fewer dropouts in multi-system venues.
  • Automatic audio level management smooths out gain inconsistencies between speakers, reducing the need for constant manual fader adjustments during a live presentation.
  • The SL Headmic 1 is a discreet, lightweight head-worn mic well-suited for unobtrusive placement on stage or in front of camera.
  • Rack-mount receiver makes installation in a standard AV rack clean and professional.

👎 Cons

  • The SL series targets speech applications specifically — it is not designed for high-SPL musical instrument pickup, limiting its versatility on mixed-use stages.
  • As a DECT system, it operates on a fixed frequency band, so you cannot manually tune to avoid a specific interference source the way you can with a traditional UHF wireless system.
  • No onboard EQ or tone shaping on the receiver means tonal correction must happen downstream in the mixer or DSP.
  • The system's automatic level management, while useful, can occasionally compress dynamic contrast in expressive or theatrical speech — a consideration for drama and performance applications.
  • Documentation and configuration depth may feel limited compared to Sennheiser's higher-tier EW or Digital 6000 series for engineers who want granular control.

Frequently Asked Questions

The SL series operates in the DECT 6.0 frequency range (1.88–1.90 GHz), which avoids the crowded 2.4 GHz and UHF bands — reducing interference risk in multi-system environments like conference centers and houses of worship.
No phantom power is needed. The bodypack transmitter is battery-powered and the receiver gets power via its rack-mount connection. The system is self-contained once installed.
The SL series handles frequency coordination automatically — the system scans for open frequencies and establishes a clean link without manual RF channel assignment. For AV techs, this dramatically reduces pre-show setup time.
Automatic audio level management adjusts gain in response to varying speaker volume, helping prevent clipping from loud presenters while maintaining intelligibility from soft voices — critical in lecture and theater environments where you can't manually ride gain.
The SL Headmic 1 is an omnidirectional capsule, which is standard for head-worn speech mics. Omni pickup tolerates head movement without the off-axis coloration or proximity effect that directional capsules introduce.

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