zombywoof
500+ Head-Fier
Damn, nice review. I'm tempted to get the y40. I'm using an Ath-m40x as my portables which I love but would like to have something lighter that sounds good.
Not sure if you are still interested in the Y40 / Y50. I had the Y40 (gave them away) and just recently picked up the Y50. Can't do a side by side comparison, but from memory, I find the Y50 to be the better of the two. I find the soundstage of Y50 to be wide, and the instrument separation to be really well defined for a portable design. Out of the box, I thought they were a bit murky, but the clarity has improved significantly with continued use (real break-in or my adaptation to the sound- who can say?). For me, the bass on the Y50 is just right. Perhaps a bit emphasized, but really we'll controlled. The detail of the mids and highs is really very good. I prefer the sound of the Y50 over my Senn MOE's. Another area where the Y50 shine is comfort. I have not had a pair of on ears (B&W P5, MOE's, and ML Mikros 90) that come close the Y50 in comfort. I have worn these for 2+ hours without issue.
For the price, these are a real find, in my opinion. I will be taking these on a business trip this week to see how they fare for air travel.