erik I had a naim setup and Line Magnetic 219 tube amp. Both PRATY amplifiers. Sold that gear to get the m-900u. Specification wise it looked like the right match for my beloved Tannoys.
The Luxman doesn't seem to have the dynamic ability and drive compared to the naim and surprisingly the lm219. They do dynamics, just a little differently.
They have a completely different presentation which I do enjoy, I was just hoping for a little more slam or jump factor. Possibly bridge that gap with it's matching preamp.