Sennheiser HD820 Closed-Back Headphones Pre-Owned MFAST frequency acquisition and MCLK3

MFAST frequency acquisition and MCLK3 asynchronous clock

5 nV/Hz Max output voltage 10V RMS RIAA accuracy +/-0

open-back Transducer type Dynamic Driver diameter 53mm Housing Honeycomb aluminum with magnesium frame Frequency response 5 Hz - 30 kHz Sensitivity 100 dB / mW Impedance 38 ohms Weight 235g (without cable) What Reviewers Say

with a linear response that makes it easy to identify problem frequencies without chasing phantom issues

the only T50RP MK3 modification officially approved by Fostex

Sennheiser HD820 Closed-Back Headphones Pre-Owned MFAST frequency acquisition and MCLK3Sennheiser's flagship closed back headphone, the HD 820 uses Gorilla Glass ear cup covers with a concave design borrowed from reflector telescope technology to redirect sound reflections away from the driver. The result is a closed back headphone that sounds unlike any other. Type and Technology Over ear, closed back, dynamic. 56mm ring radiator transducer derived directly from the HD 800S, with concave Gorilla Glass ear cup covers that manage