Pros: Pure Class A, Full discrete, Full balanced, No noise and No channel imbalance digital attenuator called LECUA
Cons: none at all
SA-11S3 + P-700u + HD600/650 or TH900 combo sounds really heavenly!.
Sounds no harshness at all compare to cheap amps such as O2 etc.
Slightly warm sounding not analytical. Sound very smooth and organic.
I you want a end game headphone amp, This is it. Period.
FYI some infos.
0.0035% at 8 Ohms load 1kHz 1W
0.0020% at 16 Ohms load 1kHz 1W
RCA in > Unbalance Out : 110 dB
XLR in > Balance out: 115dB