Pure. Professional. Performance.Online reviewers, top audio professionals and cult followers have long agreed that the ATH-M50 is an unmatched combination of audio and build quality, whether in the studio or on the go. That award-winning formula is embodied in the newly remastered M-Series line, with a model perfectly suited for every discerning listener. Contoured earcups seal tight for excellent sound isolation, with minimal bleed. And the pro-grade materials are durable, yet comfortable. M-Series professional monitor headphones deliver accurate audio and outstanding comfort that gets the job done. Hour after hour, year after year.ATH-M20xATH-M30xATH-M40xATH-M50x15- 20,000 Hz15- 22,000 Hz15- 24,000 Hz15- 28,000 Hz40 mm40 mm40 mm45 mm96 dB96 dB98 dB98 dB700 mW1300 mW1600 mW1600 mW47473538NoNoYesYes15° Both Directions15° Both Directions15° In / 90° Out90° Both Directions9.8" straight9.8" straight3.9- 9.8" coiled, 9.8" straight9.8" straight, 3.9- 9.8" coiled, 3.9" straight6.7 oz7.8 oz8.5 oz10 oz