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sorry bud, that's just false, and buying into the 600ohm is > all headfi hype. why not listen to beyer, the maufacturers first.
I have 880-600s and 250s beyers w/ decent quality amps so i know, not simply regurgitating misinformation on the web.
Who's buying into anything - I have been pointing out the manufacturers recommendations (which include running with a 100ohm impedance headphone amp.... how many of those are there around !?!) and assuming that others are regurgitating misinformation is insulting.
The beyer A1 is rated for 100mW into 600ohm - Working through the maths that makes for 7.75V - that would be ear/skull spliting deafness inducing volume.
So a 12V powered headphone amp will be within the ballpark.... viable if not ideal.
Even 9V powered is possible (as shown by some users here who use portables with their 600ohm HP's)
Will things run better with better / more powerfull PSU's most definitely - but often the more important criteria will be how clean the power is rather than how high the voltage.
Hence users with battery powered 9V amps will at times get better results because there is no hash/noise/rubbish on their powerline.
This is the problem with soundcards - they live in an inherently noisy environment and feed of noisy power. - This CAN be improved (see
http://www.cicsmemoryplayer.com/ ) but takes some work.
First question is therefore what is "Good Enough" (given that we are not all driving around in Rolls Royces, Ferraris, or Mac Trucks - there are different definitions of "best" let alone "good enough")
And given the posters query - the answer is - Plug in and suck it and see.... it is easy enough to add an amp later!
The Claro soundcards do have a good reputation for sound quality - so that would not be money wasted.
It also depends on what one wants to achieve - if gaming is involved - then a soundcard is almost essential for positional audio, as most DAC's don't decode things like Dolby Headphone etc...
For best / ultimate sound quality you would have to go with pro level external DAC's (Lavry, Mytek, Benchmark) - and then possibly connect a headphone amp to the DAC.
A notch down there is a marketplace full of good sounding DAC's and there are pro level Soundcards (Lynx, RME, e-mu, M-Audio).
I would suggest his first step is a good soundcard - that provides the source.
Next step (if SQ is to be improved) - is the amp (which assumes that one has tried the soundcard and found it wanting). You can get VERY good amps for under $300 - and of course there are steps beyond that (the sky is always the limit) - and then there is DIY for those that are that way inclined.
My own 600ohm beyers are doing very well out of my M-Stage and almost as well out of a Cute Curve.