Re: "best" headphones
"The very best headphones from the sound purity point of view (as proved by broadcasters including the BBC)"
Oh, then you've never heard a pair of Sennheiser Orpheus or a set of Stax Lambda Pro / 404's, properly driven by a high-end amp, either with full-tilt high-end sources, have you??
Yes, I compromise from my Stax setup when I'm not sitting still at home, but Beyer DT100's the 'best'? Errr....
Anyway, I am going to (reasonably) assume that these $949 Dyson headphones have the sound quality of $99 headphones with a fan motor attached to them to eat up the balance of your hard-earned, yet stupidly-spent, money.