Lectrosonics D4-SYSTEM
Digital Wireless System

D4-SYSTEM

The D4 digital 4-channel wireless system was designed as a special purpose system for location production in film and television.
A typical application for this system is in television production as part of what is commonly called a “bag system.” A portable mixer and several wireless microphone receivers are carried in an over-shoulder carrying case. The D4T transmitter is connected to the outputs of the mixer to transmit up to four audio channels to one or more D4R receivers mounted on video cameras.

The system is designed for line level analog audio signals and AES/EBU digital audio signals and can be set up as a 2-channel or 4-channel system with options that provide:

• Digital in/Digital out (< 1 mS latency)
• Digital in/Analog out
• Analog in/Digital out
• Analog in/Analog out (2.2 mS latency)

In the 4-channel mode, the D4 system operates on one of four 4 MHz channels in the 902 to 928 MHz band. Each channel carries four separate audio signals, digitally multiplexed within a common carrier.

The audio quality is suitable for any professional application in film, television and live sound. 48 kHz/24-bit audio, ruler-flat 20-20000 Hz frequency response, ultralow distortion and high dynamic range assure excellent audio reproduction.

Operating range is very similar to top of the line Digital Hybrid Wireless® microphone systems.

The LCD interface makes setup simple and straightforward. Any external power source in the 9 to 16 Volt range may be used.

Housings and panels are machined aluminum with electrostatic powder coated and anodized finishes and laser etched marking for durability.

Features:

• DTV-free unlicensed ISM band 902-928 MHz
• Digital or analog inputs; digital or analog outputs
• 24-bit, 48 kHz audio
• 2 or 4 channel operation
• Extended operating range
• Channel pairing for stereo monitoring
• Powered by 9 to 16 VDC

Overall System Specs (see PDF document for further details)

• Operating Spectrum: 902 - 928 MHz
• Center Frequencies (MHz):
  4-channel Mode: 907.776, 912.387, 916.992, 923.904
  Four 4-channel systems can operate simultaneously
  for a total of 16 audio channels.
• Center Frequencies: (MHz):
  2-channel Mode: 906.624, 908.928, 911.232, 913.536, 915.840,
  918.144, 922.752, 925.056
  Eight 2-channel systems can operate simultaneously
  for a total of 16 audio channels
• Modulation Type: Differential QPSK with Forward Error Correction,
  spread spectrum
• Occupied Bandwidth: 4 MHz (4-channel mode), 2 MHz (2-channel mode)
• Audio Sampling: 48 kHz, 24-bit
• Latency (overall system):
  Digital In/Digital Out: Less than 1 mS
  Analog In/Analog Out: 2.2 mS
• Selectable Audio Channels: 4 digital, 2 digital, 2 analog, 4 analog
• Audio Performance (overall system):
  Frequency Response: 20 Hz - 20 kHz, +/– 0.5 dB
  THD+N: < 0.05% (1 kHz @ –10 dBFS)
  Dynamic Range: > 104 dB A-weighted
  Adjacent Channel Isolation: > 93 dB

Our Part #  D4-SYSTEM