Your daily routine may take you to all kinds of places where you dont want to be. But jbl reference 400 headphones are your ticket out. With large, accurate transducers in compact on- and over-ear designs, 400 series headphones deliver rich, powerful sound with plenty of the bass punch for which jbl is famous. If compact-but-powerful sounds like a winning combination, brace yourself for another one: lightweight-but-rugged. Jbl 400 series headphones are designed for hours of comfortable use.