Just tired a ton. In general I was surprised how low the volume got on each of them through my iPhone vs my SE215s. I guess I really would need an amp. I thought the shure 750dj were incredibly uncomfortable. Didn't like at all. I tried the shure 840 and they had too little bass. I liked the m50 and dt770 pros about the same. Both sounded good and felt good. After all of this though I'm very underwhelmed. I think after reading all of the forums I was expecting to be blown away and I just wasn't. I tried the m50s through a preamp using iTunes and it was better than my iPhone but still not what I was expecting. I think I set my expectations too high. So this means I should either stick with IEMs or get an amp to use with these. Not sure what ill do. I really like how comfortable these were vs shoving foam in my ear canal but they may not be worth it for what I'll use them for. Anybody have any other recommendations or have had similar experiences? Was I wrong in assuming all of these should blow away my 215s, or is the issue that they would have if I would have used an amp?