Several individuals, myself included, have been fortunate enough to spend a little time with the new HE-6 as it has been on a loaner program in the US and, if I understand correctly, is extending to Europe and Asia. My review will be forthcoming but I thought I would get things started with a few brief statements and encourage others to post. The original loaner program thread, along with several comments and early reviews are at the following link:
I'm comparing the HE-6 to the HD650 (balanced), Grado HP2i (Balanced), Jade, K1K and OIIMk2. Amplification includes the TTVJ 307A and KGSS with the digital front end being a CARY 306SACD and 303/300.
My preliminary impressions are:
1) They LOVE power. I tried them on my 307A which Fang said was not adequate to drive them and he was right. Using my Aragon Palladium monoblocs (most recent version) made them really show their stuff, with the best low end I have encountered in headphones. Mids and highs were also exceptional with great detail but without being fatiguing. Soundstage was quite large compared to most other headphones save the K1K. It remained natural and served the music well without bringing attention to itself.
2) These are EXCEPTIONAL headphones and are something very special. As we all know, there is no one best headphone as many have their unique strengths. However, the HE 6 seems to take the best qualities of many of the finest headphones and blend them all into one amazing listening experience that catapults the Head-Direct HE-6 into the top tier, and perhaps the very top, of the world's finest headphones.
Simply put these are my, and I think soon to be many others, desert island headphones.
The HE-6 are planned for full release in mid September per Head-Direct.