They are analytical, not warm and not my cup of tea. They are also way overpriced. So you get some fancy vu meters, big deal, those get old after a while and then you gotta live with that sound. Sugden is way better and cheaper. Yea, no flashy meters, but smooth, warm, and inviting sound. It says, sit down and listen for a long time.
Luxman tonality
I’ve seen many members describing the Luxman 509x and the m duo as warm thus colored. I’ve had these units and have never thought of them as bright or dark(warm). They are superbly neutral to me neither adding or subtracting. I find them to be very musical. A prospective buyer might pass on Luxman thinking that they won’t match up with many speakers. Of course they will. Neutral is neutral. It’s what we should want.