Denon DJ updated its HP Series of headphones with three new models this week at DJ Expo 2015. Building on its previous HP500, HP700, and HP1000 models, the brand new HP600, HP800, and HP1100 headphones all come with swivel cups, 1/8″ jacks with 1/4″ adapters, and folding designs that make them easy to store and transport to and from gigs.