improving digital amp sound

Doesn't the EVO2 use a switching-mode power supply? IME power supply is even more critical for switching-type amps than conventional A/AB/B amps. That's why the Rowland 3.. series amp is much more expensive than the other ones.
I myself am using a pair of hypex amp modules (www.hypex.nl) with oversized toroid transformer, they sound wonderful, not as warm as the PassLabs X250.5 which I used to own, but the presence and the detail are more with the hypex module amps.

I have to say that I am using my digital amp with French speakers. French speakers tend to be fast, but a little lean, and a little bright on top, so maybe not the best synergy. I have been auditioning Sonus Faber Cremonas and Dali 800's as possible replacement. I was going to pair them with new Bel Canto monoblocks. I also own a Mccormack amp, and I have to say it is a very warm and pleasant sounding amp.

Ps. The new series of Bel Canto amps do use a switching power supply. The older generations used a traditional toroidal power supply.

like 'any' amp, matching with the proper room and speaker is still going to make the biggest difference.