Tubes might add to the system as the Nautilus' are basically a monitor like speaker and output whatever signal you give them. The Levinson is a great amp, but has no emotion as well, it just outputs what you give it. You could either change out the amp to something with tubes or go with a more emotional speaker. I had the N805s and liked them alot, but decided to change to JM Labs Mini Utopias. A used pair of Micro Utopias or maybe even Mini Utopias if you get lucky might be in your price range. I assume that these would give you more emotion. I would try this first. If this was not to your liking, you could always change out the amp and go with something else. Maybe some other Cary Gear or if you like SS, then maybe Plinius or Sim Audio. Good luck, if you have any question please feel free to email me and I have a lot of experience with similar gear.