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Overview

The MH-800-072-01 is an LT-800-072-01 with customized settings. The MH-800 has outstanding audio quality and can be used in a variety of applications. The MH-800 connects to the main audio system, to broadcast a high quality audio signal to receivers distributed to the meeting house audience. The end result is hearing loss audience members can hear and understand the message better because they have their own receiver and headset. The signature Look & Listen™ LCD shows channel, lock, programming and RF power.

Includes

One (1) MH-800-072-01 Meeting House Transmitter (LT-800-072 with customized setting)
One (1) LA-207 Power Supply for LT-800
One (1) Line Cord
One (1) Quick reference card

Highlights

  • Superior audio quality – setting the industry’s sound quality standard
  • 57 channels
  • 100% Digital – Listen transmitters are digitally-tuned so the transmission won’t drift
  • Use up to six (6) simultaneously on 72 MHz
  • Look & Listen™ LCD shows channel, channel lock, and programming information
  • Balanced/Unbalanced Inputs – you can interface with any audio source on the market
  • Designed for installation – rack mountable with optional remote antennas make installation easy and service reliable
  • Auto Processor – to condition the audio for voice/music prior to transmission
  • VU level meter and test tone – simply makes the installation easier to set-up
  • Many accessory options make Listen products ideal for a wide range of applications
Configurations & Architectural Specs

Configurations

MH-800-072-01 Meeting House Transmitter

Architectural Specs

The stationary RF transmitter shall be capable of broadcasting on 57 channels. The transmitter shall have an SNR of 80 dB (SQ On) / 60 dB (SQ Off) 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 MH-800-072-01 is specified.

The MH-800-072-01 Meeting House Transmitter is set to and locked on channel A with Super Quiet (SQ) turned Off.

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 selected LDS Meeting House channel A, 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
SpecificationMH-800-072-01

Audio

Frequency Response50 Hz - 15 kHz (±3 dB)
Signal-to-Noise RatioSQ enabled 80 dB, SQ disabled 60 dB
Audio Input 1Rear 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 2Rear panel, two (2) phono connectors, unbalanced, -10 / +10 dBu nominal input level adjustable, +30 dBu maximum, impedance 100k ohm
Audio ProcessingCompression can be turned on/off, slope internally adjustable from 1:1 to 4:1, default 2:1
ContourCuts and boosts frequencies above 5 kHz
Distortion< 2% total harmonic distortion (THD) at 80% deviation
Audio OutputInput 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 OutputFront panel, one (1) 3.5 mm (0.14 in.) stereo connector, unbalanced, adjustable output level, +3 dBu maximum, impedance 10 ohm

Controls

User ControlsFront 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 AdjustmentsCompression ratio for audio processor
ProgrammingSQ on/off, process on/off, channel lock

Indicators

LCDChannel designation, lock status, RF power level, programming (front panel)
Audio Input Status LEDsIndicates Input 1, Input 2, and Mix audio levels; 10 segment LED's (8 green, 2 red)
ProcessingIndicated by a green LED when on (front panel)
Test ToneRed LED illuminates when test tone is enabled.
RF PowerIndicated on the LCD (low, mid, high)

RF

Frequency Range72.025 - 75.950 MHz
Number of Channels17 wide band, 40 narrow band
Frequency Accuracy± .005% stability +32º to +122 ºF (0º to +50 ºC)
Antenna TypeVarious antennas available
Transmitter Stability50 PPM
Transmission RangeUp to 1,500 ft. (457 m)
Antenna ConnectorBNC
Output Power80,000 uV at 3 m
Number of Simultaneous Transmitters6

Power

Power SupplyIn line power supply, Listen part number LA-207 (Line cord is determined by the each Country's AC power standards)
Power Supply Input100-240 VAC, 50-60 Hz, 0.4 A
Power Supply Output12 VDC, 1.3 A, 15.6 W
Power Supply Connector0.02 in (5.0 mm) OD, 0.01 in. (2.5 mm) ID, barrel type
ComplianceUL, CE, GS, TÜV, RoHS

Physical

Width8.50 in. (21.5 cm)
Height1.75 in. (4.5 cm)
Depth9.13 in. (23 cm)
ColorDark Grey with white silk screening
Unit Weight with Power Supply3.5 lbs. (1.6 kg)
Shipping Weight6.0 lbs. (2.7 kg)
Rack MountingOne (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)
Weight2.6 lbs. (1.2 kg)

Environmental

Temperature - Operation-10 ºC (14 ºF) to +40 ºC (104 ºF)
Temperature - Storage-20 ºC (-4 ºF) to +50 ºC (122 ºF)
Relative Humidity0 to 95% relative humidity, non condensing

Compliance

SafetyRoHS
RFFCC Part 15, Part 90, Industry Canada
Requirements
Used With
Accessories
FAQ
QCan this transmitter be powered with a DC voltage?
AYes. The transmitter must use the supplied 12 VDC power supply.
QThe signal being transmitted is inconsistent, my receiver cuts in and out.
AThe receiver may be out of range of the transmitter.
QI can't change the channel on my transmitter, help?
AThe 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.
QI can't access the narrowband channels on my transmitter, help?
AThe 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.
QMy transmitter seems to have lost power/range.
AMake 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.
QHow many RF transmitters can I have operating simultaneously?
A72 MHz: 8 simultaneous transmissions
QWhat does the LT-800 Transmitter "contour" knob do?
AThe contour knob boosts or cuts frequencies above 5kHz. It is recommended that this knob be turned counterclockwise for voice and clockwise for music.
QWhat does the LT-800 Transmitter "process" feature do? When should I use it?
AThe 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.
QWhere should I have the input level switches positioned on the back of my transmitter?
ADepends 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
QCan I use the LT-800 transmitter with other manufacturer's receivers?
AYES. 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.
QWhat channels should I be transmitting on?
AIt is recommended that wideband channels are used for best audio quality. If transmitting multiple simultaneous channels, narrowband frequencies may be required.
QIs there a limit to the number of transmitters I can use in one room?
AYes. The 72 MHz LT-800-072 has a maximum of (8) eight.
QDoes the LT-800 include the rack mount?
ANo, but an LA-326 Universal Rack Mounting Kit is available for purchase.
QDo I need a transmitter for each audio source?
AEach audio source requires a transmitter.
QHow many receivers can I have on a system?
AAs 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".
QWhat is the range of the LT-800 transmitter?
ADepends 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.
QWhat type of microphones can I use with the LT-800 transmitter?
ADynamic 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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