My Cambridge Audio S700 makes 128kbps MP3s, whilst sounding a little lifeless, more than listenable to... maybe its not ADDING anything to the quality, but its certainly NOT taking anything away, 128k MP3s on MY computer sound exactly the same (the well encoded ones anyway) as my CD-Rom playing through the IDE cable
No, I'm not saying that 128k MP3s are the saviour of humanity, and i'm not saying that 128k MP3s will magically sound better than a Wadia CD player if you put them through a DAC, but what I am saying is... that if you put them through a DAC, it would filter out the sonic nasties, and after all memph is trying to get the best sound out of the HD580s...
How many people who have been recommending the META42 actually have one????
The standard configuration is known for its extended treble presentation... heck, if it can turn my syrupy CD1700s into really fast paced all-rounders... that tells you something, and just think about all that treble energy that would be going out of the soundcard into the headphones... so that takes ME back to my original point of the CHA47... its a matter of compromise whatever way you go...
Soundcard -> DAC -> META42 -> Headphones... probably the best you can do with a PC, and the DAC, amp and 'phones can be transferred to a full sized CD player as and when
Soundcard -> META42 -> Headphones... Still listenable, don't get me wrong... but all the RFI interference will be transmitted as faithfully as the MP3 itself through the META
Soundcard -> CHA47 -> Headphones... The compromise, a cheaper... darker, some would say inferior sounding amp, I myself do not think so... simply that the EQ curve is slightly different, lending to a weightier mid-bass, richer mids and a less extended treble... if you're not going for a DAC, this will basically hide some of the RFI noise but still give you a good sound
At the end of the day, as I said earlier you cannot turn lead into gold with the META, put rubbish in... get rubbish out... to me the META is a WYSIWYG kind of amp, which is great strapped onto the end of a good quality CD system where there are no sonic nasties... but through a computer????
and, how inexpensive the CHA47 is... at the end of the day, you could use, find out that it isn't so hot with MP3s and then comfortably seek alternatives... whereas, blow all of your budget on a high spec META... only to find i'm right about the treble, and RFI... then what can you do?
just my $0.02