OK, I plugged in the D10 at lunch and let it play until I returned home from work. I'll now agree with ohenry that it's the best low cost dac I've encountered yet as well. Not only Topping DACs but more than 5 DACs from other brands. The D10 is very clear and detailed, quite good bass, decent warmth and liquidity. That balance may take some experimentation with different cables. In my system slightly warm to warmish cables were not a good match, leaner, brighter (silver clad) ones worked better. I almost didn't purchase the D10 since I was so satisfied with the D20. Curiosity got the best of me with the ability to change the opamp, and I'm now glad I ordered it. Probably won't experiment with any opamp change for at least several weeks.
John