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This product is available through authorized resellers.

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Overview

Offering outstanding audio clarity, digital signal strength, and 57 selectable channels, the LT-800 is a perfect RF transmitter choice for a wide range of applications. Connected to your main audio system, the LT-800 broadcasts strong, reliable audio to both belt pack receivers and stationary receivers, ideal for providing listeners with the best possible assistive listening experience.

Includes

One (1) LT-800 Stationary RF Transmitter (72 MHz)
One (1) LA-207 Power Supply for LT-800
One (1) Line Cord
One (1) Quick reference card

Highlights

  • 100% digital signal transmission across up to six (6) channels simultaneously
  • Look & Listen (TM) LCD display for quick channel, programming, and channel lock status information
  • Balanced and unbalanced audio inputs allow for use with any audio source
  • Built-in auto processor optimizes audio (voice or music) prior to transmission
  • 57 available, selectable channels
  • VU level meter and test tone for simple installation and set up
  • 30-day, no-obligation demonstration available for your venue or business
  • Backed by Listen Technologies’ limited lifetime warranty and hassle-free support
Configurations & Architectural Specs

Configurations

LT-800-072-01 Stationary RF Transmitter (72 MHz) (North America)

Architectural Specs

The stationary RF transmitter shall be capable of broadcasting on 57 channels. The transmitter shall have an SNR of 80 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 and a mixed signal output. 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-800-072 is specified.

1. POWER: 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 your 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. SQ™ LED: (Super Quiet Companding Technology) can be turned on and off from the front panel.
7. LCD DISPLAY: Shows channel selected, channel lockout, programming, and RF power.
8. RF ANTENNA OUTPUT: Top mount antenna jack for top mounted telescoping antennas.
9. MONITOR LEVEL: Earphone jack and volume control to check audio integrity of transmission source.
10. CHANNEL SELECT: UP/DOWN channel selection of 57 channels. User can easily change between Basic and Expanded modes.
11. TEST TONE: The test tone level is adjustable, which adds flexibility when setting up and testing system.
12. RF ANTENNA OUTPUT: Top mount, rear mount, and remote antenna options.
13. RF POWER LEVEL: Multiple transmitter power settings (full, ½ and ¼) with indication on LCD display.
14. POWER INPUT: In-line power supply (included) attaches.
15. AUDIO OUTPUTS: Two (2) phono connectors for a mixed output of Inputs 1 and 2.
16. AUDIO INPUT 2: Two (2) unbalanced phono audio inputs. Select either +10 dBu or -10 dBu.
17. INPUT 2 LEVEL SWITCH: Set switch to match the level of Input 2 source.
18. INPUT 1 LEVEL SWITCH: Set switch for line or mic level. Phantom power available in Mic-PH power position.
19. 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-800-072-01

Audio

Frequency Response 50 Hz - 15 kHz (±3 dB)
Signal-to-Noise Ratio SQ enabled 80 dB, SQ disabled 60 dB
Audio Input 1 Rear panel, one (1) Female XLR or 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

Controls

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 SQ on/off, process on/off, channel lock

Indicators

LCD Channel designation, lock status, RF power level, programming (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)

RF

Frequency Range 72.025 - 75.950 MHz
Number of Channels 17 wide band, 40 narrow band
Frequency Accuracy ± .005% stability +32º to +122 ºF (0º to +50 ºC)
Antenna Type Various antennas available
Transmitter Stability 50 PPM
Transmission Range Up to 305 m (1,000 ft.)
Antenna Connector BNC
Output Power 80,000 uV at 3 m
Number of Simultaneous Transmitters 6

Power

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 0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
Compliance UL, CE, GS, TÜV, RoHS

Physical

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 1.6 kg (3.5 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.)

Environmental

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

Compliance

Safety RoHS
RF FCC Part 15, Part 90, Industry Canada
Requirements
Used With
Accessories
FAQ
Q Can this transmitter be powered with a DC voltage?
A Yes. The transmitter must use the supplied 12 VDC power supply.
Q The signal being transmitted is inconsistent, my receiver cuts in and out.
A The receiver may be out of range of the transmitter.
Q I can't change the channel on my transmitter, help?
A The unit is locked on a channel. To unlock, hold the channel select "Up" for 3 seconds. The padlock icon will extinguish from the LCD display.
Q I can't access the narrowband channels on my transmitter, help?
A The transmitter is in "Basic mode" and all narrowband channels are locked out. To enter "Expanded mode" and transmit on a narrowband channel, hold the channel select "Down" button while turning on the unit.
Q My transmitter seems to have lost power/range.
A Make sure that the antenna is connected properly. Make sure that the RF power switch is in the correct position. A more efficient transmit antenna may be needed.
Q How many RF transmitters can I have operating simultaneously?
A 72 MHz: 8 simultaneous transmissions
Q What does the LT-800 Transmitter "contour" knob do?
A The contour knob boosts or cuts frequencies above 5kHz. It is recommended that this knob be turned counterclockwise for voice and clockwise for music.
Q What does the LT-800 Transmitter "process" feature do? When should I use it?
A The process feature is a type of Automatic Gain Control. If your input signals to the transmitter are inconsistent in level and you wish to have gain control, then this should be turned on.
Q Where should I have the input level switches positioned on the back of my transmitter?
A Depends on the level of audio being input. When using Input 1: • MIC position: For a microphone or MIC level input of -55dbu. • MIC Phantom Power: For a condenser microphone that needs a 12VDC phantom power supply at a -55dbu level input. When using Input 2: • +10dbu/SPKR position: When connecting a speaker or any other higher line level audio input. • -10dbu/Line position: When connecting a regular line level input of -10dbu
Q Can I use the LT-800 transmitter with other manufacturer's receivers?
A YES. Please refer to the frequency compatibility charts in the manual or on the website for channel conversions. When using other manufacturers products, SQ (Super Quiet) must be turned OFF.
Q What channels should I be transmitting on?
A It is recommended that wideband channels are used for best audio quality. If transmitting multiple simultaneous channels, narrowband frequencies may be required.
Q Is there a limit to the number of transmitters I can use in one room?
A Yes. The 72 MHz LT-800-072 has a maximum of (8) eight.
Q Does the LT-800 include the rack mount?
A No, but an LA-326 Universal Rack Mounting Kit is available for purchase.
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".
Q What is the range of the LT-800 transmitter?
A Depends on the following:
  • The frequency of the transmitter.
  • The transmitter's location.
  • The antenna being used on the transmitter and receiver.
  • The location of the remote antenna (if applicable). In general, the higher the antenna the more range.
  • The length of coaxial cable ran to the antenna from the transmitter (if applicable). Every foot of cable creates a power loss.
  • The RF power setting on the transmitter.
  • The objects between the transmitter and receiver. All material, especially metal, will weaken the signal strength.
  • When using 72 MHz, a direct line of sight distance of 305 m (1000 ft.) from the transmitter can be achieved.
Q What type of microphones can I use with the LT-800 transmitter?
A Dynamic microphones can be used when the Input 1 level select switch is in the "MIC" position.Condenser microphones can be used when the Input 1 level select switch is in the "MIC + Phantom Power" position.

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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