Sennheiser SL Bodypack DW
SpeechLine DW Wireless Bodypack Transmitter


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The Sennheiser SL Bodypack DW is a bodypack transmitter for the SpeechLine Digital Wireless Microphone System, designed exclusively for speech- and lecture-related applications. The transmitter is easy to use, and provides a range of benefits to novice wireless system users – like optimal speech intelligibility, advanced 256-bit AES encryption, and license-free operation within the 1.9 GHz range. The transmitter also shares features of the Speechline DW system itself – including automatic frequency-, interference- and audio-level management.

This transmitter runs on Li-Ion battery technology, can operate up to 20 RF channels range (dependent on local regulations), and has app-based remote monitoring and maintenance available for iOS or Android via the Wireless System Remote. In addition, the bodypack transmitter features an LC display showing wireless link name, battery status, and reception quality.

Sennheiser SL Bodypack DW Features:

  • Frequency Management:
    • Allows on-site real-time scan upon starting up your system, finding frequencies without any need for manual fine tuning.
  • Audio Level Management: 
    • Lets you adjust volume levels for audio clarity. Adjusts gain levels and sensitivity to ensure the best signal-to-noise ratio.
  • App-based remote monitoring and maintenance: 
    • Lets you monitor and operate your wireless system via the Wireless System Remote available for iOS an Android.
  • Automatic Interference Management:
    • Seamlessly switches to a free wireless channel in the event of a frequency disturbance.
  • Optimal speech intelligibility: Audio presets for maleand female voices, as well as preconfigured sound profiles for dedicatedsettings.
  • Li-Ion battery technology: Up to 15 hours of batterypower
    • Additional power-related features include USB charging and system component runtime prediction
  • 256-bit AES encryption: 
    • Strongest encryption algorithm for secure wireless transmission. 
    • Encryption key(s) generated individually whenever a microphone connects to a receiver.
  • License-free operation within the 1.9 GHz range: 
    • 1.9 GHz wireless frequency band is far less busy compared to other frequencies like Wi-Fi. Unaffected by legislative changes.

Sennheiser SL Bodypack DW Specifications:

  • RF output power: adaptive, up to 250 mW(country-specific)
  • AF frequency response:
    • Mic: 50 Hz to 20 kHz
    • Line: 20 Hz to 20 kHz
  • Max. input level:
    • Mic: 2.2 V RMS
    • Line: 3.3 V RMS
    • Line input impedance: 1 MOhm
  • Input sensitivity: automatic sensitivity adjustment
  • Power supply:
    • Accupack: BA 30 (Li-Ion, 3.7 V), typ. 15 h
    • Batteries*: 2x AA size battery (1.5 V), typ. 11 h
      *Not included
  • AF connection socket: 3.5 mm jack socket, lockable
  • Weight (w/o accupack): approx. 88 g

Sennheiser SpeechLine DW System Specifications:

  • AF Frequency Response: 20 Hz to 20 kHz
  • Dynamic range: > 120 dB (A)
  • THD (1 kHz): typ. 0.1 %
  • Audio sampling: 24 bit/48 kHz
  • Signal-to-noise ratio: > 90 dB (A)
  • Encryption: AES 256
  • RF frequency ranges:
    • USA: 1,920 to 1,930 MHz
    • EU: 1,880 to 1,900 MHz
    • Brazil: 1,910 to 1,920 MHz
    • Taiwan: 1,880 to 1,895 MHz
    • Japan: 1,893 to 1,906 MHz
  • Modulation: GFSK with back channel
  • Transmission method:
    • TDMA
    • Space diversity
  • Latency: 19 ms
  • Temperature range*: relative air humidity max. 95 %
  • Operation: –10 °C to +55 °C
  • Storage: –20 °C to +70 °C

*Influenced by battery characteristics

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