My experience with OK1 so far.
I am a passionate singer and have a well trained ear.
My standard earphones for the past ten years have been a ten dollar Sony's, to me they are very neutral and open. I have had a Yuin Pk1 and Pk2 a Grado SR80i and a Senheiser MX 980, all 100-150 euro (except Pk2). The Sennheiser is a ripp off for the money, it offers good voice but sounds only slightly better than my Sony's. The Grado I never liked, to me it isn't musical, I would recommend it for film because of the good bass. Yuin Pk1 and 2 I have listened to on an Ipod and Cowon D2 without amplifier, mp3, and I liked them a lot. Especially for classical and accoustic. I listened to them a lot while biking and I remember looking up sometimes because it seemed like the sound was coming from high in the sky. That's typical for these earbuds.
But the Ok1 is an entirely different class. I have listened to them on an Ipad and could sense that it lacked power very well, than hooked it up to a 20 euro micro amplifier, it sounded fuller but still didn't sound very well. Finally I hooked them up to my Chromebook: jaw dropping. Hi-fi quality, it sounds like 1000 euro headphones. I owned 400 dollar a pair Dali floor speakers and Ok1's sound better.
I'm listening to this now. http://www.veniceclassicradio.eu/ Full, open, deep and beautiful bass with the cello sonata's. Yuin's always have a softness to them, they sound friendly. Very clean and clear. Yuin's tend to go straight to the heart for me as well.
Now I have to think about what to do with mobile listening. Maybe buy a Cowon and a 100-200 euro amplifier when I have the money..(I should sell the Grado and the Sennheiser, the Yuin's all broke down).
That's another thing, Yuin's tend to break very fast. I'm a mountainbiker and I generally don't expect them to last for more than a year. But being an avid music listener and strongly preferring non IEM's (I want to hear traffic) I have no choice.
Edited by wouterdrucker - 3/26/13 at 5:14pm