Listening to a pair of 600w/4ohm NC500 equipped monoblocks, same as what the the Belcanto Ref600 monoblocks use with "smd supplies", which I didn’t mind a while back so long as they drove the easy load that had a very benign 6ohm load in the upper mids/highs of a two way using a Raal ribbon tweeter.
But these monos I have are used with my own big "linear supplies" in them with large capacitance and large toroidal transformers. Which made the whole sound a better on the same speaker, just as powerfull/dynamic but less contrived, more analogue not as Class-D sounding, but richer/bigger/easier.
Cheers George