Headphone demo comparison videos

These are useful, within limits of all the tech involved of course. I've been listening using HD800's.

How Does Sonic Sense Record Headphones for Online Audition and Reviews?
https://www.youtube.com/watch?v=jnK1Gq7txYA&index=1&list=PLecOL5MQ-Vp9RNGov0g0F-4jegG3u46-v

Headphone Comparisons playlist
https://www.youtube.com/playlist?list=PLecOL5MQ-Vp9RNGov0g0F-4jegG3u46-v

I've only watched this one so far:

Sennheiser HD800 Review: AKG K812 vs BeyerDynamic T1 vs UltraSone Edition 12
https://www.youtube.com/watch?v=DXD6wFEpYeA&index=3&list=PLecOL5MQ-Vp9RNGov0g0F-4jegG3u46-v


They also do the same thing with speakers, mics, etc:
https://www.youtube.com/user/SonicSenseProAudio/playlists

They also have a soundcloud channel with some more. I'm not sure if soundcloud has higher resolution audio.