You have some very fine McIntosh units. Your speakers are rated at 5 ohms, dipping to l.6 ohms at 20,000 hz. Your speakers are also recommended to have an amp that delivers from 20 watts to 400 watts. I also have a McIntosh front end and use them to drive ML Summit X's. Even in my large listening room, the amp never goes above 20 watts per channel. Unless you live in a frat house or something, you have more than enough power for the Sources. Someone may tell you that you're going to get a rolled off high end but I am using a McIntosh C2300 tube preamp and a MC2205 amp, and am getting great sound through the Summit X's.
