ListenIR LT-82 is a single channel transmitter that is capable of operating in either mono or stereo modes. The stationary infrared transmitters can be daisy-chained together to transmit up to four channels simultaneously on 2.3/2.8/3.3/3.8MHz. The channel selection can be locked by the engineer to avoid tampering whilst a timer shuts off the carriers after 30 minutes when no audio is present at the transmitter. With an audio frequency response of 63Hz to 15kHz, +/-3db, the transmitter allows a single balanced 3-pin XLR input along with unbalanced RCA (phono) inputs. With automatic gain control and limiting, the transmitter has controls for input level, transmission level, contour level, and stereo on/off. LT-82 also provides power to up to two LA-140 radiators. via CAT-5e cable.
Included accessories: LA-205 30V DC power supply, LA-89 coaxial cable, quick start guide.
Dimensions (HxWxD): 45 x 215 x 230mm. Weight: 1.18kg
LT-84 is a two-channel infrared transmitter and radiator combined within a single piece of hardware. It can provide line of sight coverage of up to 30,000 square feet (2787square metres) when combining with the LR-4200-IR belt pack receiver. The range can be improved by linking up to four LA-141 expansion transmitters, a maximum of two per expansion link output, by Cat-5e cable. The user can select one of four FM wide band frequencies for each of the two channels. Available frequencies include 2.3MHz, 2.8MHz, 3.3MHz, and 3.8MHz. The radiator can be mounted in a number of ways including on walls, ceiling or table using the included LA-344 mounting hardware kit.
The front panel has no controls, only the infrared radiator which is housed behind the infrared transparent panel. The rear panel has all user controls and audio/data inputs and outputs for the two channels and links. Both channels have a 3.5mm balanced jack input suitable for electret microphones, dual unbalanced RCA (phono) inputs for an audio input from other hardware such as CD player or DAB radio, and a 3-pin Phoenix style detachable terminal block connector for a balanced audio input. Controls for each channel include a rotary level control with LED level indicators, recessed rotary frequency selector and sliding transmission on/off control. A separate sliding switch situated next to the 12V DC power supply input controls power; it has three positions, off, on with LED status lights, on with no LED status lights, the latter for situations where flashing LEDs may cause distraction. Two RJ-45 output links can be used to connect option LA-141 expanders with a maximum connection cable length of 30m.
Included accessories: LA-210 12V DC power supply, LA-344 mounting hardware, 2x Phoenix type connectors, quick start guide, LA-303 signage.
Dimensions (HxWxD): 38.1 x 272 x 105mm. Weight: 0.4kg.
A compact, stationary radiator/emitter that is available in either grey or white finish and designed for use with the LT-82 transmitter to expand the coverage. The radiator can be mounted in vertical or horizontal orientation, and the included mounting hardware allows for wall, ceiling, desk, microphone stand, or tripod mounting. LA-140 has a maximum coverage of 3,716m2, and up to two LA-140s can be powered from a single LT-82 transmitter via CAT-5e cabling.
Included accessories: Mounting hardware (wall/ceiling/desk/mic stand/tripod), 1x 7.6m colour matched coax cable, 1 x 7.6m colour matched CAT-5 cable, quick start guide.
Dimensions (HxWxD): 140 x 66 x 203mm. Weight: 0.95kg
LA-141 Transmitter expander
Up to four LA-141 transmitter expansion units can be connected to a single LT-84 transmitter-radiator to expand the coverage to avoid dead-spots or reach receivers which are hidden from line of sight . The rear of the unit has two RJ-45 link connections for expansion, a two way switch to control the LED indicator on/off status and a recessed rotary control for each channel offering delay compensation. A compensation table listed in the user manual shows the settings to use dependent upon frequency and cable length.
Included accessories: 1x 7.6m CAT-5e cable, LA-344 mounting hardware, quick start guide.
Dimensions (HxWxD): 38.1 x 272 x 105mm. Weight: 0.28kg.