Agree with others. Solid state high current survivors just don’t struggle with speaker loads. My old Crown offers only one set of outputs but lists power specs for 16, 8 and 4 ohm loads.
Vintage amplifier specifications
I've noticed when I read vintage amplifier specifications, and by vintage I mean 70's,80's maybe 90's, I do not see power output specified at 4 ohms. Did those older amplifiers not do well on 4 ohm speakers so leave that information out or was it not considered a a matter of interest to the buying public. Maybe something else?