I listened to the Ether Flow (EF) for the first time today and now I am seriously irritated. Let me explain: I took half of my rig to my local dealer and compared the Ether Flow to my 650s with the Jotunheim. Source was my Fiio X3ii. What can I say. The 650s sounded like shit in comparison. I couldn't believe it. Before I liked them a lot. Right now I am listening to them at home and I am content with them. But in comparison - no way. NO BASS. They sounded like tin cans. No body, rather thin. The main difference was certainly the bass punch and impact of the EF, which the 650s are lacking. Especially felt with kick drum and tom-toms in songs like One oder Sad but true by Metallica, for example. Additionally, the EF sounded so much more natural (probably equals to "sound that I like") in comparison, so it was not only the bass. An analogy came to my mind: At home I got the Fidelio X2 for comparison and albeit they have lots of bass (which I tend to like), they sound kind of wrong in comparison to the 650s. The sound is somehow hollow, which actually might be the mids missing due to the V-shaped sound signature. Back to the analogy: The relationship between EF and 650s reminded me of the relationship between the 650s and the X2. One is just right, the other somewhat off. The EF was connected via a balanced cable, but I don't think this would be the reason for the rather large differences (650s were SE). I actually believe it's the planar magnetic bass extension (?) that made the main difference. At the end I plugged in a LCD2 and it was in the EF-camp. Slam of the kick drum and an enjoyable, "natural" sound. Again, this took me by surprise, because I expected the EF to be a bright headphone and now it slammed the 650s hard from the bottom up. I am very irritated that I don't like the 650s in comparison, but on their own I like their sound (just missing the bass punch a little right now ;-) I am very interested in your thoughts about this.