Isn't comparing the Luxman 590axii to the Accuphase line kind of an apples and oranges comparison. The 590axii is a true class A amp. Isn't the Accuphase line class A/B? Major difference.
IMHO, the Luxman 509x (being class A/B) would be a much more accurate comparison to the Accuphase 600/650 vs the Luxman 590axii. And, as someone has already mentioned, even the newer and older versions of the 590ax sound different from one another...let alone sounding very different from the Accuphase line. It stands to reason, if you prefer class A/B amps you're going to prefer the Accuphase line to the Luxman 590axii.
IMHO, the Luxman 509x (being class A/B) would be a much more accurate comparison to the Accuphase 600/650 vs the Luxman 590axii. And, as someone has already mentioned, even the newer and older versions of the 590ax sound different from one another...let alone sounding very different from the Accuphase line. It stands to reason, if you prefer class A/B amps you're going to prefer the Accuphase line to the Luxman 590axii.