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System Overview
The WIR TX90 two channel infrared transmitter combines infrared modulator and emitter technology into a single
mountable enclosure - reducing operating cost and eliminating precious rack space.
The WIR TX90 features an easy to use configuration preset for Music, Voice, or Hearing Assistance Applications.
It operates on dual 2.3/2.8 or 3.3/3.8 MHz selectable frequencies - ideal for high quality audio programs such
as music, theater and audio description. The WIR TX90 will accept any line level, balanced or unbalanced audio
inputs, and includes adjustable tone and volume control. Infrared receivers detect the transmission and convert
the light signals back into audio signals. The 2.3-3.8 MHz operating frequencies minimize high efficiency lighting
interference.
No FCC license or radio approval is required with this equipment. It can be used anywhere in the world.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his own expense.
NOTICE: A plasma monitor can degrade the audio quality of the SoundPlus™ Infrared Listening System.
Figure 1: Typical Two-Channel configuration for the WIR TX90
