Sennheiser SpeechLine Digital Wireless SL Headmic Set DW‑3‑AU‑R (Rackmount)

The Sennheiser SpeechLine Digital SL Headmic Set DW‑3‑AU‑R is a professional wireless presentation and speech system, optimized for clarity, reliability, and ease-of-use. Designed specifically for speech, this set features the ultra-light and discreet SL Headmic 1 headworn condenser microphone, paired with a high-performance bodypack transmitter and a rack-mountable receiver module.

This rack version (“‑R”) includes all the hardware necessary for rack installation, making it ideal for conference rooms, lecture halls, AV systems, houses of worship, and professional presentation environments.

? Key Features & Benefits

• Clear speech intelligibility via optimized audio processing and headworn mic design :contentReference[oaicite:0]{index=0}
• Omnidirectional headworn condenser capsule for stable, natural sound even with movement :contentReference[oaicite:1]{index=1}
• Lightweight and discreet – the SL Headmic 1 weighs ~7 g (without cable) :contentReference[oaicite:2]{index=2}
• Automatic frequency & interference management – seamless channel switching and robust RF performance :contentReference[oaicite:3]{index=3}
• 256-bit AES encryption ensures secure audio transmission :contentReference[oaicite:4]{index=4}
• Rechargeable battery pack with up to ~15 hours operation and USB recharging :contentReference[oaicite:5]{index=5}
• Lockable 3.5 mm jack socket for secure connection :contentReference[oaicite:6]{index=6}
• Rackmount receiver included (‑R version) – integrates cleanly into professional AV racks :contentReference[oaicite:7]{index=7}

? Technical Specifications

• Frequency response: 20 Hz – 20,000 Hz :contentReference[oaicite:8]{index=8}
• THD (total harmonic distortion): ~0.1 % typical :contentReference[oaicite:9]{index=9}
• Polar pattern (mic): Omnidirectional :contentReference[oaicite:10]{index=10}
• Nominal impedance (mic): 1 kΩ :contentReference[oaicite:11]{index=11}
• Equivalent noise level: 27 dB (A) :contentReference[oaicite:12]{index=12}
• Max SPL (passive): 143 dB :contentReference[oaicite:13]{index=13}
• Audio dynamic range: > 120 dB (A) :contentReference[oaicite:14]{index=14}
• Sampling rate / format: 24 bit / 48 kHz :contentReference[oaicite:15]{index=15}
• Battery / Power: Rechargeable Li-ion battery pack (~15 h runtime) with USB charging :contentReference[oaicite:16]{index=16}
• Outputs: Balanced XLR (rack receiver) :contentReference[oaicite:17]{index=17}
• RF sensitivity: < –90 dBm :contentReference[oaicite:18]{index=18}
• Power consumption (receiver): ~350 mA :contentReference[oaicite:19]{index=19}

? What’s in the Box (‑R Rack Version)

• SL Headmic 1 headworn condenser microphone
• SL Bodypack DW transmitter
• SL Rack Receiver (for rack installation)
• BA 30 rechargeable battery pack
• Rackmount kit & mounting hardware
• Accessory pouch and user guide :contentReference[oaicite:20]{index=20}

✅ Ideal Applications

• Lecture halls, classrooms, and auditoriums
• Conference rooms and boardrooms
• Houses of worship (sermons, liturgy)
• Corporate presentations and events
• Broadcast and speech reinforcement systems

? Why Choose the SpeechLine Digital SL Headmic Set DW‑3‑AU‑R?

With its combination of professional-grade wireless performance, secure transmission, automatic interference management, and a nearly invisible headworn mic, the SpeechLine SL Headmic Set DW‑3‑AU‑R is built for speakers who demand clarity without fuss. The rackmount receiver makes integration into AV systems seamless, while the slim, low-weight design of the headmic minimizes distraction and maximizes speech quality.