Please check out my review of this amp at Partsexpress.com, mine is the first review. I also wanted to add that I opened up the amp and it uses high quality parts. Besides the main IC chip, the Texas Instruments TPA6120A2, I found a Burr-Brown OPA2604 and Panasonic FM Electrolytic Capacitors. Very impressive little amp. Impressive not only because of the quality parts, but overall sound and performance.
Link to my review:http://www.parts-express.com/smsl-sap-ii-pro-tpa6120a2-headphone-amplifier--230-224
