A pricey pair of semi-closed headphones, but do they offer true high-end sound?

What are the Sennheiser HD 820?

The Sennheiser HD 820 are part of one of the most illustrious lines in the entire headphone world. These are top-end Sennheiser cans, outside the limited-run Orpheus series, which at €30,000 or more are the preserve of oligarchs and famous rappers.
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