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Businesses or venues can broadcast on one of three channels of assistive listening audio. The LT-803-072 Stationary 3-Channel RF Transmitter is an excellent choice. Universal inputs allow for the use of nearly any audio source including mixers, micrphones, MP3 players, and more, and our signature Look & Listen (TM) LCD display provides immediate information about channel, lock, and RF power. The LT-803-072 also includes a power supply making it easy to set up and start using right away.


One (1) LT-803-072 Stationary 3-Channel RF Transmitter (72 MHz)
One (1) Power supply
One (1) Quick Reference Card


  • Affordable, feature-packed transmitter option for basic assistive listening systems
  • Three-channel selection design makes it simple to manage, and use
  • 100% digital audio transmission for solid, reliable signal
  • Look & Listen LCD display
  • Works with any audio source on the market
  • 30-day, no-obligation demonstration available for your venue
  • Compatible with a wide range of Listen Technologies accessories
Configurations & Architectural Specs


LT-803-072-01 Stationary 3-Channel RF Transmitter (72 MHz) (North America)

Architectural Specs

The stationary RF transmitter shall be capable of broadcasting on one of any three channels – A (72.100 MHz), E (72.900 MHz) or H (75.900 MHz). The transmitter shall have a SNR of 62 dB or greater. The output power shall be adjustable to quarter, half or full. Channel tuning shall be capable of being locked. The device shall have an audio frequency response of 50 Hz to 15k Hz, ‘± 3 dB at 72 MHz. It shall have two (2) mixing audio inputs. The device shall have the following audio controls: input level, mix level and an adjustable low pass filter (contour). The device shall have an audio processor that is capable of automatic gain control and limiting. The Listen LT-803-072 is specified.

CAD file(s)

1. POWER BUTTON: Easy access from the front to turn unit On/Off.
2. INPUT 1 & 2 AND INPUT LEVEL INDICATORS: Adjust audio levels of Input 1 and 2. Dual VU meters shows audio Input 1 and 2 levels.
3. MIX LEVEL & MIX TRANSMIT LEVELS: Mix Level control sets level of mixed audio. VU meter shows the output level of mixed audio.
4. CONTOUR: Contour equalization Cuts/Boosts frequencies above 5 kHz.
5. PROCESS LED: Processing (automatic gain control and compression) can be turned on and off from the front panel.
6. LCD DISPLAY: Shows channel selected, channel lockout, and RF power.
7. MONITOR LEVEL: Earphone jack and volume control to check audio integrity of transmission source.
8. TEST TONE: The test tone level adds flexibility when setting up and testing system.
9. CHANNEL SELECT: UP/DOWN channel selection of 3 channels (A, E, H).
10. RF ANTENNA OUTPUTS: Top mount, rear mount, and remote antenna options.
11. RF POWER LEVEL: Multiple transmitter power settings (full, ½ and ¼) with indication on LCD display.
12. POWER INPUT: In-line power supply (included) attaches.
13. AUDIO OUTPUTS: Two (2) phono connectors for a mixed output of Inputs 1 and 2.
14. AUDIO INPUT 2: Two (2) unbalanced phono audio inputs. Select either +10 dBu or -10 dBu.
15. INPUT 2 LEVEL SWITCH: Set switch to match the level of Input 2 source.
16. INPUT 1 LEVEL SWITCH: Set switch for line or mic level. Phantom power available in Mic-PH power position.
17. AUDIO INPUT 1: Balanced XLR / ¼ inch audio input. Select either mic, line, or mic phantom power level for input. Electret (Condenser) microphones can be used with Input 1, mic, and phantom power.

Product Specifications
Specification LT-803-072-01


Frequency Response 50 Hz - 15 kHz (±3 dB)
Signal-to-Noise Ratio 62 dB (A-Weighted)
Audio Input 1 Rear panel, one (1) Female XLR and 1/4 in combo connector, balanced, 0 / -55 dBu (line/mic) nominal input level adjustable, -30 / +21 dBu (line/mic) maximum input level, impedance 20k / 1k ohm (line/mic), phantom power +12 VDC
Audio Input 2 Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohm
Audio Processing Compression can be turned on/off. Slope internally adjustable from 1:1 to 4:1. Default 2:1
Contour Cuts and boosts frequencies above 5 kHz
Distortion < 2% total harmonic distortion (THD) at 80% deviation
Audio Output Input 1 and input 2, mixed output (rear panel), two (2) phono connectors, unbalanced, -10 dBu nominal output level, +15 dBu maximum, impedance 10 ohm
Headphone Output Front panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm


User Controls Front Panel: Power, Test Tone on/off, Channel up/down, Input Levels, Mix Level, Contour, Monitor volume controlRear Panel: Input 1 Level, (Line, Mic, Mic-Phantom Power), Input 2 level (-10 / +10 dBu), RF power level (low, mid, high)
Internal Adjustments Compression ratio for audio processor
Programming Process on/off, channel lock


LCD Channel Designation, lock status, RF power level (front panel)
Audio Input Status LEDs Indicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)
Processing Indicated by a green LED when on (front panel)
Test Tone Red LED illuminates when test tone is enabled
RF Power Indicated on the LCD (low, mid, high)


Frequency Range (A) 72.100, (E) 72.900, (H) 75.900
Number of Channels 3 wide band
Frequency Accuracy ± .005% stability 0 to 50ºC (32 to 122º)
Antenna Type Various antennas available
Transmitter Stability 50 PPM
Transmission Range Up to 305 m (1,000 ft.)
Antenna Connector BNC, 50 Ohms (Use RG-58 < 100 ft or RG-8 > 100ft)
Output Power 80,000 uV at 3 m


Power Supply In line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)
Power Supply Input 100-240 VAC, 50-60 Hz, 0.4 A
Power Supply Output 12 VDC, 1.3 A, 15.6 W
Power Supply Connector 5.0 mm (0.02 in.) OD, 2.5 mm (0.01 in.) ID, barrel type
Compliance UL, CE, GS, TÜV, RoHS


Width 21.5 cm (8.50 in.)
Height 4.5 cm (1.75 in.)
Depth 23 cm (9.13 in.)
Color Dark Grey with white silk screening
Unit Weight with Power Supply 2.0 kg (4.5 lbs.)
Shipping Weight 2.7 kg (6.0 lbs.)
Rack Mounting One (1) rack space height, 1/2 rack space wide. One (1) or two (2) transmitters can be mounted in one rack space,optional rack mount (LA-326)
Weight 1.2 kg (2.6 lbs.)


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


RF FCC Part 15, Part 90, Industry Canada
Used With
Q What is the range of the LT-803-072 transmitter?
A Line of site up to 305 m (1,000 ft.) with remote antenna.
Q Does the LT-803-072 include the rack mount?
A No, but an LA-326 Universal Rack Mounting Kit is available for purchase. Antenna options for rack mounting also available.
Q Is there a limit to the number of LT-803-072 transmitters I can use in one room?
A Yes. The maximum is (3) three.
Q Is the LT-803-072 compatible with Listen's other receivers (LR-300-072, LR-400-072, LR-500-072, LR-100-072, and LR-600-072)?
A Yes. Remember, the LT-803-072 has only three (3) channels (A, E, H) therefore the receiver will need to be tuned to one of those channels. Also, the SQ (Super Quiet) function must be turned off on the receiver.
Q Do I need a transmitter for each audio source?
A Each audio source requires a transmitter.
Q How many receivers can I have on a system?
A As many as you want. The transmitter simply transmits a signal and you can have as many receivers pick that signal up as necessary. It's like a radio station transmitting and the receivers are the radios tuning into the "channel".

We've been impressed by the Listen system's ease of use (and installation), as well as its flexibility. The difference between your system and what we had been using is amazing. Patrons are happy and thus, so are we.

James D. Anderson
Director of Audio, McCallum Theater
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