He's deleted the tweet. A new tweet seems to correct it "I confirmed from Sennheiser yesterday there is another change to the rear-damping. So [removing the tape] wouldn’t *completely* reverse the 8XX’s modifications [from the 800s]." https://twitter.com/dms3tv/status/1435667743077019648 I appreciate that Sennheiser were forthcoming. Could have been messier. In general, I don't think we should be an echo-chamber for youtubers. Posting this just bc he has access to a HD8xx and Sennheiser.