This is only going to effect a small percentage of the prospective market for the Sennheiser HD 820. The rest are people who want an absolute top-flight open-backed headphone and ran into a shared living space issue. You can’t listen to HD 800 in the same room as someone else because they pump so much sound into the room, it’s like having a pair of small speakers tied to your ears. Sennheiser’s HD 820 gives you a surprising amount of the HD 800 S sound, but without all the leaking. You can listen to the BBC Proms with all the detail and edge-of-the-seat excitement they bring, all the while sitting next to someone quietly knitting and watching Midsomer Murderson TV.
Type: circumaural closed headphone
Frequency response: 4Hz–51kHz (-10dB)
Transducer principle: dynamic
THD (1kHz, 1Vrms): < 0.02 %
Connectors: 6.3mm, XLR4
Cable length: 3m
Manufactured by: Sennheiser Electronic GmbH & Co. KG