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 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.