Over time I've gone through what I consider to be fairly many headphones, and in the end to my preference I keep coming back to HD650s. Partly because the sound signature makes almost anything sound good, and partly because the slightly laid back treble makes them extremely gentle on my ears (no fatigue, which I do get from most other headphones).
Unfortunately I can't effectively use HD650s at work since closed-back headphones are a necessity to block out sound from both directions. I've been looking around for good "work headphones" for a while, and I'm wondering if anything exists that would have a similar sound signature to the HD650. I don't care too much if the sound quality is below the HD650 because I assume that's to be expected from a closed headphone.
Right now I use the Audio Technica A900X for my closed/work headphones, and I'm pretty satisfied with them all-around. "Unfortunately" the treble is not at all laid-back like the HD650, which means they generate some ear fatigue if I listen to them too long.
Any ideas on options to look into? Thanks.