Ok, well ive got the AKG k702s now and i have to say they sound quite amazing without an amp even, i cant wait to see what they sound like when i get the xonar stx.
edinsftw
Hey there, edinsftw, I did a bit of digging for you just because I've been educating myself in the headphone arena in general. I'm going to say that you should be fine with the headphone amp built into the card:
The high Impedance (Z) headphone amplifier used on this card is the Texas Instruments
TI6120A2 which provides better then 120dB dynamic range, a SNR of 120dB and a fast Slew Rate of 1300 V/µS add the fact that this amplifier circuit is swinging from -12 V to +12 volts and we have a serious high fidelity power source for demanding headphones.
The THD+n graph from the specification sheets show impressive results and this amplifier chip has very low distortion within the audio bandwidth. (Guru3D
- TI6120A2 spec sheets from Texas Instruments: TI6120A2 (PDF)
- Asus Xonar STX Manufacturer Page
Looking at the circuit design of the board, the caps that it's using, the EMI/RFI shield; I'd be more worried about a secondary amp introducing noise into the system. To summarize: It's a damn nice card built specifically for audiophile headphones. The k702s are rated at 62 ohms with a max of 200mW, which might mean about 100mW RMS (AKG does not specify). Regardless, the card is putting out a very clean signal with 80 mW at 600 ohms, which means it will put out even more power with the k702s rated at 60 ohms. Clean signal, lots of power, happy listener.
I would suggest reading the Guru3D review in detail; it has some tips about settings in the Asus software you might find useful, including gain settings (Normal, to match the 60 Ohm gain of you AKGs). Also, if you have a dedicated MOLEX, be sure to use it (avoid piggybacking).
If I ever upgrade my headphones I'll have to put some serious thought into getting this card.
Boz
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