@audioconnection +2. You need to think about the quality of the electronics involved, as well as issues like impedance matching. Use your ears, but it's extremely likely you'll prefer avec pre-amp.
Should I eliminate my preamp?
I have been using my Audio Research tube preamp and Bryston amp to drive Magnepan speakers for years. Recently I added a Oppo blue ray player to my system and connected directly to my amp using the balance cables. The reason was to eliminate the signal having to go through another piece of equipment before it hits the amp. Am I wrong or what am I missing?