...I honestly think the HP50 is one of the best headphones that my ears have had the pleasure of listening to. I've heard the Sennheiser HD 800, HD 650, JH13 Pro, Westone ES5 and a few other top tier headphones or IEM's and though they all sounded draw droppingly amazing; they don't incorporate all of the traits and characteristics that the HP50 possesses.
The HP50 to my ears are just as strikingly clear and accurate as the top headphones that I have heard.
The HP50's bass extends deep and it's incredibly controlled and textured.
Here [in the midrange], the HP 50's offers this in spades giving a well-proportioned, exceptionally balanced and crystal clear presentation. Also, it takes it further because of its spatial presentation being so expansive, the vocalists sound as if they are actually in front of you, personally singing to you. It's a sort of like euphoric 3D experience that you have to hear in order to understand. The RoomFeel tech is no gimmick.
The treble is well articulate with a hint of roll off to give a natural presentation and reduce listening fatigue. This is the treble that I personally lust for.
The soundstage size as well as the instrument separation of the HP50 is not something that is normally associated with a closed back headphone. It really sounds like a open back headphone with a presentation that is completely out of my head and very coherent; sort of 3D like. Detail rendition is also exceptional capturing the subtle textures and cues to really make the instruments and musical environment sound as if it is actually in front of you.