I just received a shipment of 48V/10A power supplies. They are huge and heavy, almost as big as the A7 mono. I didn't notice any changes in the sound On the less pleasant side... Just when I received the shipment, the price per unit dropped in the 3eaudio store by almost a third...
My understanding is that the 48v/10A is mainly to allow the amp to be 2ohm stable. It shouldn't have any impact on the sonic qualities of the amp, which is why you wouldn't notice a change in the sound.