Designed for measuring in-ear monitors often used on stage, the Audix TM2SP is an accoustic coupler intended for conducting tests on any pair of IEMs. Think of the TM2 as a measurement microphone system, but instead of a pair of speakers, you're measuring the frequency response and other performance specs of in-ear monitoring systems to make sure they're ship-shape for use on stage.
The TM2 utilizes technology previously found in laboratory testing equipment into a package that is agnostic when it comes to the brand of IEM in question. Thus, the system is an all purpose, simple, and effective way to test the performance specifications of a pair of in-ear monitors.
With a complete adapter set, any kind of in-ear monitor can be tested. Simply wedge an IEM into the earphone coupler, connect the coupler to an audio interface over the XLR output, and make the other necessary connections for routing test tones (usually a feedback loop of some kind). Then, you engage your favorite software for measuring equipment (Rational Accoustic's SMAART and Studio Six Digital's Audio Tools are two popular programs that will work with the TM2SP). With all the connections made, the TM2 will then be able to test an in-ear monitor, so that your artists will know their in-ear monitors are performing to the best of their ability. The TM2 runs on your interface's phantom power supply. In addition to a complete set of adapters, an individualized calibration file is included, as well as a carrying case.