From your description, it sounds like you are describing the Sennheiser HD650. I just got a pair for Christmas and I really like them. I find them to be pretty neutral with very good, but not overpowering bass. They are also very much non-fatiguing IMHO. I'm very sensitive to boomy bass and hot treble and I can listen to the HD650s for hours without fatigue.
I'm currently just using a NuForce Icon as head amp/DAC as I had one laying around. It works great. However, do some reading over on the Head-Fi site and you will get lots of other recommendations for headphone amps to use with the HD650s.
I bought my pair over on the big auction site. There is a seller there who sells lots of them (new, in retail box) for a great price.
Also, according to the folks on Head-Fi forum, you can do lots of mods to increase the performance, if you want. Many folks remove foam, re-cable, convert to balanced operation, etc. and generally tweak the heck out of them. For now, I'm perfectly content and don't plan to do anything to mine. I'm just enjoying listening to them.
Enjoy,
TIC
I'm currently just using a NuForce Icon as head amp/DAC as I had one laying around. It works great. However, do some reading over on the Head-Fi site and you will get lots of other recommendations for headphone amps to use with the HD650s.
I bought my pair over on the big auction site. There is a seller there who sells lots of them (new, in retail box) for a great price.
Also, according to the folks on Head-Fi forum, you can do lots of mods to increase the performance, if you want. Many folks remove foam, re-cable, convert to balanced operation, etc. and generally tweak the heck out of them. For now, I'm perfectly content and don't plan to do anything to mine. I'm just enjoying listening to them.
Enjoy,
TIC