These headphones deliver a nice

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One feature we all agreed we didn't like was the detachable hands-free microphone. The MM 80 comes in two parts: the earphones on a 50cm cable; and a speakerphone microphone on a 1 metre cable, with a 3.5mm connection inheadphones (http://www.goodej2010.com/) the middle. In total, the cable from end to end is a sufficient length, but you could comfortably use the earphones only — the cable would go as far as your shirt pocket. Having the cable in two parts suggests a choice that doesn't exist, you either use the hands-free attachment, or you don't use the headphones. With this being the case, we'd much prefer the unit to have been integrated into one unified piece.The MM 80s advertise in-flightBose headphones (http://www.goodej2010.com/) use on the tin, but offers only noise reduction, not true noise cancellation. We haven't had a chance to test the MM 80s on a trans-Pacific flight as yet, but we do feel the phones do a decent job of blocking out ambient sound in the various places we tested them on the ground. Sennheiser also wisely include an in-flight adapter so you can get stereo sound on a plane.PerformanceIf nothing else, the MM 80s maintain our impression of the consistently excellent sound of Sennheiser headphones. These headphones deliver a nice, even mixture of sound across the low, mid and high frequencies, tending tcheap headphones (http://www.goodej2010.com/)owards the sharper sounds rather than just banging on the bass. Compared with the MM 50s, the MM 80s deliver a richer sound, with the MM 50s sounding slightly duller with the direct comparison.