Lectrosonics DSR4 4-Channel Digital Slot Mount Receiver

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The Lectrosonics DSR4 Digital Receiver provides the highest level of RF and audio performance available with a versatile feature set in a compact design for field and location production. Settings can be made from the front panel with tactile buttons and color LCD interface, making the unit ideal for use in portable bag systems and on sound carts. An RF spectrum analyzer and SmartTune are built into the receiver to alleviate interference problems in an increasingly congested RF spectrum.

The mechanical design of the receiver fits into the Super-Slot ecosystem and combines field-proven features developed over many years of experience in motion picture and television production. To decrease weight, the DSR4 provides a four-channel receiver in one unit powered by external DC. The receiver is also equipped with an IR port for data transfer between units. The machined aluminum housing and panels are surfaced with a hard-anodized finish with laser etched markings to withstand the rigors of field production.

The RF gain stages in the front end use a newly developed design to provide low noise RF amplification, excellent sensitivity and extremely low susceptibility to intermodulation and de-sensitization.

Diversity Options
An ideal diversity system constructively combines all the energy available at both antennas. The DSR4 offers two diversity options: for 4-channel operation, each channel combines signals from both antennas in or out of phase, depending on field strength at each antenna and which combination yields the best results. For 2-channel operation, receivers can be paired for Vector Diversity operation. The Vector subsystem smoothly and continuously combines RF signals from both channels, with differing phase angles in order to obtain maximum energy. The four receivers in the DSR4 can be used separately or combined in pairs.

Compatibility
The DSR4 offers compatibility with the D-Squared and Duet digital transmitters, including the DBu, DHu, DPr, DBSM, DCHT, and M2T, and backward compatibility with any Digital Hybrid Wireless transmitters including the SM and SMWB series, WM, HM Series, MM400 Series, HH Series, LT, LMb, UM400 Series, and SSM.

SmartNR
With a noise floor at -120 dBV and a frequency response to 20 kHz, high frequency noise in the source audio is more apparent than in conventional wireless systems. The Smart NR algorithm has three modea. When OFF, no noise reduction is performed. When NORMAL is selected, enough noise reduction is applied to remove most of the hiss from the mic preamp and some of the hiss from lavaliere microphones. When FULL is selected, enough noise reduction is applied to remove most of the hiss from nearly any signal source of reasonable quality, assuming levels are set correctly at the transmitter.

Lectrosonics DSR4 Digital Receiver - Features:

• Four independent channels, compact design
• Two diversity options for maximum flexibility
• 24 bit/48 kHz digital for flawless audio
• AES 256-bit, CTR mode encryption, with 4 different key policies available
• High IP3 performance of +15 dBm for tough RF environments
• Analog and AES3 digital audio outputs
• External DC powering options and USB input for firmware updates and data transfer

• Operating Frequencies:
  • Model A1B1: 470.100 - 614.375 MHz
  • Model B1C1: 537.600 - 691.175 MHz
  • 941: 941.525 - 959.825 MHz
• Frequency Selection Steps: 25 kHz
• Frequency Stability: ± 0.001 %
• Front End Bandwidth: ± 5.5 MHz @ -3 dB
• Sensitivity:
  • 20 dB SINAD: 1.0 uV (-108 dBm), A-weighted
  • 60 dB Quieting: 1.12 uV (-105 dBm), A-weighted
• AM Rejection: > 60 dB, 2 uV to 1 Volt
• Modulation Acceptance: 85 kHz
• Spurious Rejection: 85 dB
• 3^rd Order Intercept: +15 dBm
• Diversity Method: Antenna phase switching (4 channel operation); Vector diversity (2 channel operation)
• Antenna Inputs: 50 Ohm; SMA female connectors
• Audio Outputs Connectors:
  • Interchangeable D connector adapters for camera slot interfaces
  • Dual TA5 male (mini XLR) balanced output adapter
  • Battery sled adapters with TA5 male outputs
  • Front panel TA5 male for analog output channels 3 and 4
• Audio Performance (Overall System):
  • Frequency Response: 25 Hz to 20 kHz (+0/-3 dB)
  • THD: 0.2% (typical)
  • SNR at Receiver Output (db):

  SmartNR	No Limiting	With Limiting
  OFF	103.5	108.0
  NORMAL	107.0	111.5
  FULL	108.5	113.0

• Input Dynamic Range: 125 dB (with full Tx limiting)
• Overall Latency (Time Delay): 1.4 ms with digital source, <2.9 ms with Hybrid TX
• Audio Test Tone: 1 KHz, -50 to +7 dBu, <1%THD
• Controls:
  • Front Panel:
    • Color LCD display
    • Menu/Sel, Pwr/Back, Up/Down Arrow Buttons
    • USB port
    • IR port
  • Rear Panel: proprietary connector for audio/power accessory panels
• Powering & Current Consumption: Min. 7 V to max. 18 Volts DC; 2.2 W
  • 125 mA @ 18 VDC
  • 80 mA @ 12 VDC
  • 295 mA @ 7 VDC
• External Power: Minimum 9 Volts to maximum 17 VDC 2.5 W; 170 mA at 12 VDC
• Dimensions (W x H x D): 3.23 x 1.23 x 5.5 in | 82 x 31 x 140 mm
• Weight: 14.4 oz | 408 g, w/o audio adapter