SENNHEISER HD 820 Over-the-Ear Audiophile Reference Headphones - Ring Radiator Drivers with Glass Reflector Technology, Sound Isolating Closed Earcups, Includes Balanced Cable, 2-Year Warranty (Black)

Sennheiser IE 900 Audiophile in-Ear Monitors - TrueResponse Transducers with X3R Technology for Balanced Sound, Detachable Cable with Flexible Ear Hooks, Includes Balanced Cables, 2-Year Warranty

Sennheiser IE 600 in-Ear Audiophile Headphones - TrueResponse Transducers for exquisitely Neutral Sound, Detachable Cable with Flexible Ear Hooks, Includes Balanced Cable, 2-Year Warranty

Sennheiser Hd 560 S Over-The-Ear Audiophile Headphones - NEUtral Frequency Response, E.A.R. Technology For Wide Sound Field, Open-Back Earcups, Detachable Cable, (Black) (Hd 560S)