Bel Canto Dac 3

Are you talking stray DC current? I pretty much have that covered...

Or you talking other power transients? I am running a PC power conditioner into a Adcom ACE 515...

Have the 3.0 and I concur that power is important. The 3.0 sounds better with a good power cable over the stock power cord, so therefore I'd assume that a dedicated power supply helps -- obviously that's why Bel Canto offers one although I do not.
   I don't notice any jitter harshness with 3.0 fed by a Bryston BDP1 streamer, but, what I do notice is just a little opaqueness to the presentation that I did not expect;  using the old Audio Alchemy DTI in the signal path helps slightly.