Cause of different sound between dacs

I am not able to audition the two. Perhaps someone with experience can comment?

I was very surprised at how much better my K03 sounds, compared to my Berkeley Alpha Dac (1st one). It has much more detail, more resolution, deeper/wider soundstage - I can go on and on - it was just 'better' in every plane. I am thinking power supplys, dacs and analogue output stage are all superior.

The power supply and analog circuit have the biggest impact on the sound.

"I don't use any preamp, active or passive. Makes a world of difference."

+1

Cerrot, have you compared sound with identical feeds?