The IR E4 Emitter transmits the audio input from the IR+ (IR M1). Covering a span of 18,000 sq. ft (1,670 sq. meters), a single emitter can be combined with additional IR E4 emitters to provide extra coverage.  Up to four emitters can be stacked together for large room arrays or distributed throughout the room to accommodate wings in room design, balconies or other obscured venue locations.

For the IR E4 Emitter to function, it must be connected to the IR M1 modulator. Up to 4 emitters can be connected to the IR M1 directly, and up to 16 emitters can be connected with the use of IR A4 arrays.