Used in conjunction with your Listen Technologies transmitter, the LR-100 RF Receiver/Power Amplifier delivers clear, high-quality audio performance ideal for multiple locations and applications.

Multiple input options make the LR-100 flexible to fit your specific venue and system needs, including wireless audio distribution. Our signature Look & Listen (TM) LCD display provides at-a-glance information about channel, lock, and battery status, and an integrated security cover prevents unauthorized changes to volume, squelch, and trim adjusments.

The LR-100 can be powered by either a 15 VAC/1000mA power input or 12 VDC battery, and requires only an antenna for proper reception.


One (1) LR-100-072 Stationary RF Receiver/Power Amplifier (72 MHz)
One (1) LR-100 manual
One (1) LA-201 15 VAC Power Supply
One (1) LA-123 90° Helical Antenna (72 MHz)
One (1) Hex Wrench



  • Programmable for locking in one or several of the 57 compatible channels
  • Superior audio quality thanks to an 80 dB signal-to-noise ratio (SNR)
  • Look & Listen (TM) LCD display clearly shows battery status, signal strength, and programming information
  • Multiple input options and selectable output for added flexibility


Configurations & Architectural Specs


LR-100-072 Stationary RF Receiver/Power Amplifier (72 MHz)
LR-100-216 Stationary RF Receiver/Power Amplifier (216 MHz)

Architectural Specs

The Stationary RFReceiver/Power Amplifier shall be capable of receiving on 57 wide and narrow band channels in the frequency ranges of either 72 MHz or 216 MHz. The receiver shall be programmable to electronically lock out unneeded channels. The device shall have an adjustable squelch with an LED indication. The device shall have an audio frequency response of 50 Hz to 15k Hz, ‘±3 dB at 72 MHz, or of 50 Hz to 10 kHz, ‘±3 dB at 216 MHz. The signal to noise ratio shall be 80dB or greater. The device will have an integrated 15 watt power amplifier capable of driving an 8 ohm speaker. The device shall be rack mountable and shall have the capability of a remote antenna. The device shall incorporate an LCD display that indicates channel and RF signal strength. The Listen LR-100 is specified.
Product Specifications
Specification LR-100-072


Frequency Response System: 50 Hz - 15 kHz (±3 dB)Input to Output: 25 Hz to 20 kHz (±3 dB)
Signal-to-Noise Ratio 80 dB SQ enabled, 60 dB SQ disabled (A Weighted)
Distortion < 2% total harmonic distortion (THD) at 80% deviation
Input/s One (1) female XLR-1/4 in combo connector, balanced, 0 dBu nominal input level adjustable, +13 dBu maximum, impedance 600 ohmTwo (2) phono connectors, unbalanced, -10 dBu nominal input level adjustable, +7 dBu maximum, impedance 10k ohm band, 40 narrow band


User Controls Front: Power, test tone on/off, channel up/down, input levels, mix level, contour, monitor volume controlRear: Audio output select (RX Only, RX + AUX, RX or AUX),Speaker (Output, Aux), switchable balanced output levelRemote Controls: Eight (8) position detachable terminal block, channel up, channel down, mute
Programming Unit can be programmed so that only desired channels are displayed to the user, channel selection can be locked by holding the SEEK button 5 seconds.


LCD Channel designation, lock status, RF power level, programming (front panel)
Power LED Indicated by a green LED when on (front panel)
VU Meter Four (4) LED (three green, one red)
RF Power Indicated on the LCD (low, mid, high)
Squelch Green LED illuminates when the unit is squelched
Mute Green LED illuminates when the output audio is muted


Frequency Range 72.025 - 75.950 MHz
Output/s One (1) male XLR, balanced, 0 dBu nominal output level, +16 dBu maximum, impedance 2k/10 Ohms (line/mic)Two (2) phono connectors, unbalanced, -10 dBu nominal output level, +2 dBu maximum, impedance 2k ohmOne (1) 3.5mm stereo connector, unbalanced, adjustable output level, +7 dBu maximum, impedance 10 ohmOne (1) detachable terminal block, bridged, adjustable output level, 15/10 watts (peak/RMS) continuous power with 4 ohm load
Number of Channels 17 wide band, 40 narrow band
Sensitivity .6uV typical, 1 uV maximum for 12 dB SINAD
Frequency Accuracy ± .005% stability +32 ºF to +122 ºF (0 ºC to +50 ºC)
Antenna Type LA-123 90° Helical Antenna (72 MHz)
Antenna Connector BNC


Power Supply Input 120 VAC, 60 Hz, 19 Watts
Power Supply Output 15 VAC, 1 Amp
Power Supply Connector .02 in (5.0 mm) OD, .01 in. (2.5 mm) ID, barrel type
Optional Battery 12VDC, connected via terminal block
Optional Battery Charging Trickle charge of optional 12VDC battery through terminal block connection
Power Supply Type In line power supply, Listen part number LA-201


Color Dark Grey with white silk screening
Unit Weight with Power Supply 4.2 lbs. (1.9 kg)
Shipping Weight 7.0 lbs. (3.2 kg)
Rack Mounting One (1) rack space height, 1/2 rack space wide, one (1) or two (2) receivers can be mounted in one rack space, optional rack mount (LA-326)
Dimensions (H x W x D) 1.75 x 8.50 x 9.13 in. (4.5 x 21.5 x 23 cm)
Weight 2.8 lbs. (1.3 kg)


Temperature - Operation -10 ºC (14 ºF) to +40 ºC (104 ºF)
Temperature - Storage -20 ºC (-4 ºF) to +50 ºC (122 ºF)
Relative Humidity 0 to 95% Relative Humidity, non condensing


Power Supply Compliance UL Listed
RF FCC Part 15, Part 90, Industry Canada
Used With
Q What is the function of SQ?
A To reduce noise of the systems, Listen offers a noise reduction technology called ListenSQ™. Both the transmitter and receiver must have SQ on to achieve the desired results. If you are planning to use this product with older Listen systems or equipment not manufactured by Listen, you should disable SQ.
Q How many LR-100's can I use in a system?
A As many as you need, the number is endless.
Q Can I interface this to an amplifier or powered speaker?
A Yes, both.
Q Do I run the speakers in series or parallel?
A It's your choice. However minimum impedance attached to LR-100 speaker amplifier must be greater than 4 ohms.
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