You know how headphones work: Tiny speakers are parked over or in your ears, and the music does the rest. Thing is, there's only saw far this can take you when you're dealing with a medium that is, quite literally, sensed through vibrations in your body. These over-ears try something different: They simultaneously stream their sound through mechanical vibrations that are directed at your skin, ears, and bone. The upside: A unique ability to raise the perception of loudness without forcing you to crank the dial to eardrum-breaking level as well as an more intimate method of experiencing your favorite songs. [$350 with active noise cancellation, $300 without; ableplanet.com]