Reddit mentions of HIFIMAN EF2A USB Headphone Amplifier

I'm looking for a comfortable set of headphones I can wear all day, that accurately and cleanly reproduce sound.

Budget - Theoretically unlimited, but I'm usually happy enough in the low-mid range.

Source - HiFiMAN EF2A

Requirements for Isolation - These will be used at work to drown out the noise of the mechanical keyboards my new coworkers use.

Preferred Type of Headphone - Over the ear

Preferred tonal balance - Studio monitors, I want accurate sound reproduction.

Past headphones - For years I used a pair of Sennheiser PXC-350's for travel and occasional office use. I love the sound but they are too tight on my head to wear comfortably for hours.

In the last few weeks I've tried out 3 different pairs:

• Sennheiser Momentum - I think these sounded good, but despite being sold as "over the ear" on me they were definitely "on ear". I returned them.
  
• Sony MDRV6 - I love how these sound. They're crisp and clear and everything sounds wonderful on them. The only problem is that they aren't quite big enough to fit over my ears comfortably. After an hour I have to take them off for at least 20 minutes.
  
• Sony MDR1R - These sound muddy compared to the MDRV6's, but they're so much more comfortable.
  
  Preferred Music - Vocal/R&B, Rock, Classical and occasionally Jazz. The first things I listened to when I got the two Sony headphones were Amy Winehouse, a Dvorak concerto, Pink Floyd and Joe Satriani.

that is an analog mic with an ADC then the USB interface, essentially a sound card, it isn't just a wire adapter. sound inside the computer is digital, sound outside of the computer is analog, there must be some means to convert it from one to the other. For headphones I'd use a decent DAC and amp stage, something like this for portability, or this for stationary use or FiiO E07k for ultra portability

Cheap and dirty, but reasonable quality (better than onboard sound)

Popular, good quality, doubles as a headphone amp

More High End, Tube Sound

Ahhh this one. Looks interesting and seems to be right what I'm looking for.

got one of these if interested

You own some? I am looking at this dac/amp as well as some others 2 3 4 5 and if you have any insight I would love to hear it before I burn another hole in my tight budget.

Thank you for the help. I actually need a little more help i looked a little deeper and i found two other actual tube amps and i believe they are a much better choice, but then which one.

Litte dot MKII: http://www.amazon.com/Little-Dot-MKII-Headphone-Amplifier/dp/B00A2QMAI2/ref=pd_cp_MI_2

HIFIMAN - EF-2A: http://www.amazon.com/HiFiMAN-EF2A-HIFIMAN-EF-2A-HEADPHONE/dp/B004357WL8/ref=pd_cp_MI_3

http://www.amazon.com/Hi-Fi-Man-EF2A-Tube-Headphone/dp/B004357WL8

I'll be investing in this little thing very soon, seems promising!

This one is decent enough and a good starting point. Relatively cheap and will greatly improve the quality of sound!