I’ll point out that the L-590AX, even though advertised as Class A, and putting out 30W/channel into 8 ohms, etc, has been shown to put out closer to 90W/channel into 8 ohms, over 160W/channel into 4 ohms, and is presumably in fact a Class A/B amp, contrary to Luxman’s published specs.
https://www.luxman.cz/data/test/test-en-l590axii-hifinews.pdf
http://www.navratilaudio.cz/novinky/Luxman_L590AXII_HFW.pdf
https://www.luxman.cz/data/test/test-en-l590axii-hifinews.pdf
http://www.navratilaudio.cz/novinky/Luxman_L590AXII_HFW.pdf