Have you managed to compare the Gryphon Diablo 120 to your Luxman L-509X? If yes, I would be interested in your thoughts.I read that it’s slightly darker sounding than the Diablo 300 with reduced vice-like grip in the bass. Nevertheless, still typical Gryphon sound but with less of the "magic touch" of its bigger brother.
The Diablo 300 is too heavy and chunky for my preferences though apart from the higher price.