Lectrosonics DSR 4 Channel Digital Slot Receiver

Lectrosonics DSR 4 Channel Digital Slot Receiver

Lectrosonics DSR 4 Channel Digital Slot Receiver

Key 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

The 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 desensitization.

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 use separately or combined in pairs.


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 mode. 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.


Operating Frequencies (MHz):
Model A1B1: 470.100 - 614.375
Model B1C1: 537.600 - 691.175
961: 961.100 - 1014.900
NOTE: It’s the user’s responsibility to select the approved frequencies for the region where the transmitter is operating.
Frequency Selection Steps: 25 kHz
Frequency Stability: ±0.001%
Front end bandwidth: ±5.5 MHz, @ -3 dB
Sensitivity: 20 dB Sinad: 0.9 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
Third 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 output connectors: Interchangeable D connector adapters or 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 OFF 103.5 (No Limiting)
108.0 (With Limiting)
SmartNR NORMAL 107.0 (No Limiting)
111.5 (With Limiting)
SmartNR FULL 108.5 (No Limiting)
113.0 (With Limiting)
Note: The dual envelope “soft” limiter provides exceptionally good handling of transients using variable attack and release time constants. Once activated, the limiter compresses 30+ dB of transmitter input range into 4.5 dB of receiver output range, thus reducing the measured figure for SNR without limiting by 4.5 dB.
Input Dynamic Range: 125 dB (with full Tx limiting)
Overall Latency (time delay): 1.4 ms with digital source, <2.9 sm with Hybrid TX
Audio Test Tone: 1 KHz, -50 to +7 dBu, <1%THD
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.
External Power: Minimum 9 Volts to maximum 17 VDC 2.5 W; 170 mA at 12 VDC
Weight: 408 grams (14.4 oz.) w/o audio adapter
Width: 82mm / 3.23 inches
Height: 31mm / 1.23 inches
Depth: 140mm / 5.50 inches

Specifications subject to change without notice.

FCC Notice

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications to this equipment not expressly approved by Lectrosonics, Inc. could void the user’s authority to operate it.

Delivery Services

At Pinknoise Systems we like to offer our customers a wide choice of delivery options for their orders, and our prices are affordable and competitive. We also use only the best, most reliable couriers and delivery services to get your equipment where it needs to be - quickly and securely. Please find an outline of our services, prices and timescales below.

Delivery Times

Delivery times are based on when the package(s) leaves our premises. Sometimes, due to stock restrictions or a non-completed order, delivery may take longer as there is a delay with couriers, which is unfortunately out of our hands. If your order is urgent, or details change, please do let us know.
For full details, fees, and time schedules, please see our Delivery Information page.

Returns & Refunds

New items: You can return goods you have ordered from us for any reason, at any time within 30 working days of receipt (14 to initiate the process), for a full refund or for an exchange for a different product from our range. Items must be packed suitably and insured for full loss in the event of a delivery problem. Pinknoise Systems will not be responsible for lost or damaged return goods. Lost or damaged goods may affect the level of refund you receive. For full details of our returns policy, please click here.

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£4,236.00 (£3,530.00 Exc. VAT)
Delivery hours
UK ORDERS: Order soon for delivery on using our express service

Model:  LECT-DSR4-A1B1
Part No.:  DSR4
Manufacturer:  Lectrosonics

Contact us for advice

Need advice? Give us a call

(+44) 01453
825 802

International Delivery

International delivery

We ship across Europe and around the world and have a multitude of shipping options available to our international customers during the checkout, including express delivery for urgent orders.


We have a next day shipping option available for the UK with our DPD courier service, which features delivery alerts, personal delivery preferences and driver tracking with the DPD mobile app.


Spread the cost to maximise your capital. Just call our helpful sales team on 01453 825 802, from 9.00am - 5.00pm, to discuss these options and find out what's available to you.

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Lectrosonics DSR 4 Channel Digital Slot Receiver

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