The K550's are great value now, and a brilliant upgrade from the M50s, especially if you amp them. They would be perfect for rock music

I love bass. I love amps, in going to run it through an E17. One thing I don't like in a headphone is agressive highs, I find the K550 in that bracket. How are the 900 and 750 different and why is the 750 a better choice in your opinion?

Quote:   Bump - considering i'm coming from the K550 frustrated with placement / fit - how do you all feel about moving over to the ultrasone pro 900?

Hi i'm looking for a recommendation for some closed back circumaural full sizes... i recently owned the ATH M50's which I initially liked due to the bass thump, but quickly realised they didn't hold enough clarity and the soundstage was too tight. I then bought some K550's which I immediately...

I'm prepared to accept that. Is there a fitting guide anywhere? I'll re-evaluate!

Well I did everything I could to fit them right. What more can I do except put them on my head? They are just too loose. I tried bending the top band but it did nothing. Forgive me for saying but if a £230 bit of kit can't fit your head to sound anywhere near right, they are a waste of time...

I've been on a similar journey to you, purchasing three headphones and two portable amps all at once in order to try and find something that ticks all my boxes with one bit of kit, unfortunately I don't think i've found exactly that (I'm not sure it exists!) but what i've found I can pass to...