JBL has introduced Synchros, a new line of headphones. The flagship headphones in the line are the Synchros S700 ($350) premium powered over-ear stereo headphones. Made out of aluminum, fabric, and steel, with leather ear cushions, the onyx- or glacier-colored S700 headphones use 50mm drivers, JBL LiveStage signal processing technology, and a rechargeable battery that lasts for 28 hours. The Synchros S500 ($300) are similar, but use AAA batteries…
