Yuin PK1's - impressions

[TheSloth]

Ok, so I apparently have more spare change than sense and ordered a pair of these. Couldn't resist the curiosity.

These aren't really burned in yet (only a few hours on them), but they really are surprisingly good. They look and feel like earbus, and sound something akin to a real pair of headphones. Unlike earbuds they seem to do extended bass. At the moment they sound a bit 'plasticky' and nasal in the midrange (as if you took an open headphone and then covered the backs), and I wonder how they will relax with proper burn-in.

They are extremely hard to drive - I find myself using a similar volume setting on my amp to my 650's, which makes them even harder to drive than 650's s they are half the impedance.

Anyone else tried these?

[hYdrociTy]

I have them. I use them at about 60% of the senn's volume level. Any updated impressions?