Sennheiser SL Rack Receiver DW
SpeechLine DW Digital Wireless Receiver


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The Sennheiser SL Rack Receiver DW is a digital wireless receiver for the SpeechLine Digital Wireless Microphone System, designed exclusively for speech- and lecture-related applications. The receiver is simple 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 receiver also shares features of the Speechline DW system itself – including automatic frequency-, interference- and audio-level management.

This receiver 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.

Sennheiser SL Rack Receiver DW Features:

  • Frequency Management:
    • Allows performance of 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 optimal audio clarity. AALM adjusts gain levels and sensitivity to ensure the best signal-to-noise ratio.
  • App-based remote monitoring and maintenance: 
    • Lets you easily 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:
    • Different audio presets for male and female voices, as well as preconfigured sound profiles for dedicated settings.
  • 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.
    • Unique encryption key will be generated individually whenever a microphone connects to a receiver.
  • License-free operation within the 1.9 GHz range:
    • The 1.9 GHz wireless frequency band is far less busy compared to other frequencies like Wi-Fi. Unaffected by legislative changes.

Sennheiser SL Rack Receiver DW Specifications:

  • RF sensitivity: < -90 dBm
  • RF output power back channel: Adaptive, up to 250 mW(country-specific)
  • Digital gain adjustable in steps of 6 dB:
  • Mic/line level switch: -24 dB/0 dB
  • XLR, balanced: max. +18 dBu
  • RCA, unbalanced: max. +6 dBu
  • Audio effects:
    • Low cut: -3 dB at 120 Hz
    • Equalizer: 7-band graphic equalizer with sound presets
    • Automatic gain control (AGC): compression/ expansion with automatic make-up gain function
  • Display: OLED
  • Network protocol: Media Control Protocol, TCP/IP IPv4(DHCP, manual)/IPv6
  • Power supply: 12 V DC
  • Current consumption: 350 mA
  • AF connection sockets: XLR/2 x RCA
  • Antenna sockets: 2 x reverse SMA
  • Network sockets: RJ-45
  • DC socket for power supply: hollow jack
  • Weight: Approx. 828 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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