I own a 590AX II with Harbeth 30.2's, so in theory a speaker much like the LS3/5. As for my amp and speaker match-up, I love the sound, clear, crisp but not sharp, so perhaps some would say on the warmer side. I can listen all day to it. I would say that the combination is a bit 'polite' for heavy rock and roll/metal, although I can get them louder then I ever want to listen with just Class A 30 watts, and I listen to every type of music on the setup without a concern.
I would think the Luxman 380 with the LS speakers would be amazing.
I would think the Luxman 380 with the LS speakers would be amazing.