Yesterday I tried a Fosi v3 (48v 5a power supply) i use to power bass shakers on my sim rig, very surprised how good it sounded and no issues running the Kef r3 which go down to 3.2 ohm at levels approaching 80db, a good punchy bass and slightly elevated highs, it didn't get hot after 30 mins use.
I like my highs elevated any way, might be my age over 60 and used a lot of power tools:
I would definitely recommend a listen for the price.