The Bose X (which stands for "ten," not the letter "X") is the latest in Bose's series of Active Noise Reduction headsets. The X is lighter and quieter than the Bose Series II which preceded it. With the X, Bose has abandoned its trademark gel earseals for the traditional foam cushion. They've completely redesigned the ANR system to eliminate more of the low engine rumble frequencies. One 9-volt battery powers the unit, instead of six AAs as on previous models. But one thing hasn't changed: the price. At $995, it's still the highest-priced aviation headset on the market. Is it worth it? AVweb's resident audio maven Joe Godfrey dissects Bose's new headset and compares it to the Series II and the much-less-expensive LightSPEED 20K.