Gearank

From Avantone:

The MixPhones Mp1 Triple Play Personal Monitor with Vari-Voice is the first ever multiple use headphone, suitable for use in the live sound, DJ, studio recording, mixing playback and listening applications. The unique design allows the user to move between normal neutrally voiced stereo field, monaural (mono), and a specially contoured "mix" mode that focuses the midrange frequencies to simulate the sound of our Mixcubes and allow better articulation of critical mix frequencies.