superczar
Keymaster
the difference is gonna be minimal.
I wouldn't be surprised if the SQ form the headphone actually deteriorates (for the reason mentioned in my earlier post...Most likely, the Xonar won't have enough power in the o/p stage high grade op-amps to drive a good can properly - It's not what those op-amps would be designed to do)
I would expect the Auzentech (being a more consumer oriented card) to have more powerful (albeit at the cost of distortion) op-amps
PS: I don't have personal experience with either of the cards-- And frankly, if you want a new Sound card just coz you are bored of your existing snd card, why not donate the money to a good cause instead
