Sennheiser HD 820 Over Ear Closed Back Headphones (Open Box) headphone 3.5mm Our Active Noise Cancellation II®

Our Active Noise Cancellation II® (ANC II) tech means that measured noise drops by 100x or 40dB in comparison to the common noise filter

Silver plated high purity copper wire

The tragus secures an earphone with an earpiece in such a way that makes it difficult to feel stress even when force is applied

2yu connects directly to 2go to add TOSLINK optical S/PDIF

Designed and Assembled in Portland

Sennheiser HD 820 Over Ear Closed Back Headphones (Open Box) headphone 3.5mm Our Active Noise Cancellation II®HD 820 The new audiophile standard The critics said closed headphones could never sound as immersive as their open air counterparts. They said physics would never allow it. To that we simply said, "listen". The HD 820 combines an innovative glass reflector and ring radiator transducer technology for a benchmark listening experience. Reference class open back audiophile headphones Closed back earcups 56mm ring radiator transducers German craftsmanship