Hi!For speaker cable I'll suggest looking at Zu Audio and HiDiamond.
Luxman electronics have a great synergy with Triangle Magellan speakers, they've been used together at shows for many years. Are your Quatuors the latest 40th Anniversary editions? I have the Magellan Cello 40th Anniversary edition speakers being driven by the Luxman C-900u and M-900u electronics and the combination is quite captivating. Triangle has made many evolutionary advancements in their 40th Anniversary Magellan models but the previous versions were also very well received. Enjoy your fine system Eustache, and welcome to Audio Shark! :hey:Two years ago, I had the opportunity to buy an ex dem H590. The seller told me if I want to listen first to the Luxman l590 ax2. It is worth it , he said. But it was to far from home. And I found a second hand Luxman 590ax2 and got it. I am very pleased with it to drive my Triangle Magellan Quattuor. So, I have no idea about how it can sound with the H590.