I find the Ayre sound more natural and relaxed than the Luxman. Also, to get the best possible sound you want to invest in the best possible components. So, acquiring an integrated and only using the preamp would, in my way of thinking be a real waste. Preamps are really important… and with the price range you are in I would look at a dedicated preamp… or even better yet used from Audio Research, Pass, Ayre, Conrad Johnson or Presto.
Luxman L-509X as a preamp
I have an Ayre VX-5 that I really enjoy. I am considering an Ayre KX-5 preamp to pair with it. I currently use a Rogue RH-5 and it sounds great. But I am thinking the KX-5 will have more synergy. I also have been kicking around the idea of having an integrated amp and like everything I see and hear about the Luxman L509X. I thought of picking one up and using it as a preamp for the VX-5. Has anyone else used this integrated as a pre? If so, what are your thoughts?