I have a 950 mated to a HCA 855a also. The biggest thing to remember is that it will probably be very bright to begin with. I never believed in break-in periods for audio equipment, but now I do! I had a 950 that sounded somewhat bright when I first got it. I leave my equipment on all the time, and after a few days the sound became more and more pleasant. It was "detailed" to begin with, but then the sound got even a little better. The little bit of harshness I had went away.

A month ago I got my replacement "blue dot". I hooked it up and "Oh My God does this sound bright!!!" I kept my original for a few days to compare it with the new one. Within 72 hours the brightness was gone on the new one, and it sounded better than the original.

All I am saying is that the first few days may not impress you a lot. I can honestly say that with the 1st unit I thought I was getting used to the sound when it began to sound better. After swapping out a replacement a month ago and hearing how it sounded at first compared to my 4 month old model, I am convinced that there IS a burn-in that occurs.