The R8 Digital IR 8-Channel Receiver receives the digital IR signal and offers the user channel and volume control. It is worn in a shirt-pocket or around the neck with a lanyard and uses an external headphone with a standard 3.5 mm (0.14 in.) stereo jack. The capacity is eight (8) mono standard quality channels, four (4) mono perfect quality channels, four (4) stereo standard quality channels, two (2) stereo perfect quality channels or a mix of the above.

The receiver will only display the channels and languages that are programmed on the transmitter as well as indicate the volume level, battery level and reception status on the LCD. The receiver is automatically turned off when the headphone is removed or the transmitter stops transmitting to save battery life. The battery life is 52 hours with a NiMH rechargeable battery pack or 70 hours with two (2) alkaline AA batteries.


One (1) R8 Digital IR 8-Channel Receiver


  • High quality stereo audio
  • Up to 70 hours of battery life
  • Operates on two (2) AA batteries or NiMH rechargeable battery pack
  • Automatic off mode to save battery life
  • Large LCD for easy status indication
  • Excellent 270° wide angle reception
  • Built-in error detection and correction
  • Test mode for determining signal strength
Configurations & Architectural Specs

Architectural Specs

The Digital IR 8-Channel Receiver shall be capable of receiving on eight (8) different carrier frequencies; 2.3, 3.0, 3.6, 4.3, 5.0, 5.6, 6.3 and 7.0 MHz. The receiver shall be compliant with IEC 61603-7 and IEC 60914 standards. When measured in a specified IR system the receiver shall have a weighted SNR of 80 dB (A) or better, THD at 1kHz shall be less than 0.05% and an audio frequency response of 20 Hz to 20 kHz, (- 3dB) in Perfect Quality mode. The receiver shall have a wide reception angle of up to 270°. The receiver shall accept stereo earphones with a standard 3.5 mm (0.14 in.) connector. The receiver shall have an LCD indicating channel number, channel language, reception status, volume level and battery status. The receiver shall operate for 70 hours with two (2) AA alkaline batteries or 52 hours with a NiMH rechargeable battery pack. The R8 Digital IR 8-Channel Receiver is specified.

Product Specifications
Specification R8


Frequency Response 20 Hz - 10 kHz (-3 dB) (Standard quality) / 20 Hz - 20 kHz (-3 dB) (Perfect quality)
THD < 0.05% @ 1 kHz
Cross Talk Attenuation > 80 dB @ 1 kHz
Dynamic Range > 80 dB
Signal-to-Noise Ratio > 80 dB (A weighted)
Headphone Impedance 32 Ohm to 2 kOhm
Headphone Level 450 mVrms (speech at max volume) / 32 Ohm (nominal 2.4 V battery voltage)


Power Switch On/Off switch on the front of unit
Channel Select Pivoting button to scroll to the next / pervious channel
Volume Pivoting button + / - to adjust volume level


LCD Displays channel number, language, reception status, volume level and battery status
Charging LED indicator (blinking-battery charging, On-charging complete)


Headphone Connector One (1) 3.5 mm (0.14 in.) stereo headphone connector
Battery Compartment Compartment for two (2) AA alkaline batteries or NiMH rechargeable battery pack


IR Wavelength 870 nm
Protocol and Modulation DQPSK, according to IEC 61603-7
Modulation Frequency Carriers 0 to 5: 2 to 6 MHz (according to IEC 61603-7), Carriers 6 and 7: Up to 8 MHz
Carrier Frequencies 2.333, 3.000, 3.666, 4.333, 5.000, 5.666, 6.333 and 7.000 MHz
IR Irradiance 4 mW/m² per carrier
Angle of Sensitivity 270°


Power Supply Voltage 1.8 to 3.6 V, nominal 2.4 V
Power Consumption 38 mA nominal (32 Ohm Headphone)


Width 1.82 in. (46 mm)
Height 6.11 in. (155 mm)
Depth 0.95 in. (24 mm)
Color Black
Shipping Weight 1.0 lbs. (454 g)
Weight 2.82 oz. (80 g) excluding batteries, 4.76 oz. (135 g) including batteries


Temperature - Operation 32 °F (0 °C) to 113 °F (45 °C)
Temperature - Storage -40 °F (-40 °C) to 158 °F (70 °C)
Relative Humidity < 95%
Used With
Support Info
Q If I have a 16 channel transmitter, can I buy another 16 channel transmitter for a total of 32 channels?
A Yes. It is possible to “stack” transmitters together, if you need additional channels.
Q What configurations can be set and how do I configure the Digital IR systems?
A All configurations are done via the LCD menu and the menu buttons on the front of the transmitter. Configurations such as mono or stereo, standard or perfect quality, and input sensitivity, etc.
Q Is it necessary to terminate unused outputs of the Digital IR transmitter or Radiators?
A No. Terminating the outputs is unnecessary because all outputs are terminated automatically.
Q How can I use the Digital IR for an interpretation system?
A In combination with the wired or wireless conferencing system, the Digital IR system can be used for distributing the languages provided by the floor and the interpreters to the end users. This can be accomplished by taking the audio outputs from the wired or wireless conferencing system and routing them to the inputs of the Digital IR transmitter.
Q I want to rack mount my Digital IR transmitter. Are the rack mounting brackets included?
A Yes. The rack mounting hardware is included.
Q Is there a floor stand for the Digital IR radiator?
A Yes, our floor stand LA-337 can be used to mount the radiator.
Q How can I mount an Digital IR radiator to the wall?
A VESA 100 Mount
Q How many RF or IR receivers can I use in one (1) system?
A As many as you want.
Q How can I avoid interference between lighting and Digital IR systems?
A Our Digital IR system is interference free from lighting equipment and day/sun light.
Q How many channels are available?
A Up to 40 mono channels are available. License dependent.
Q How many RAD25 Digital IR Radiators can I use on a single output of the transmitter?
A Up to 20 radiators may be daisy chained together on a single output. There are four (4) outputs available on the back of the transmitter for a total possibility of 80 radiators.
Q How much coverage can one (1) Digital IR radiator provide?
A Using four (4) mono channels of audio (1 Carrier), the maximum radiator coverage is 14,000 sqft.
Q How far can a Digital IR radiator be extended from the transmitter?
A Up to 2,953 linear cable feet.
Q When should I use Digital IR over Stationary IR?
A When you need five (5) or more channels of audio. Stationary IR offers one (1) to four (4) channels and Digital IR offers one (1) to 40 channels.
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