I am currently running C220 tube preamp driving an MC252 and an MC275 biamped to kef reference series. The MC252 should be fine for your needs unless you have a large room trying to achieve high SPL'S. If you have duetta's then you are probably not listening in a large room.
McIntosh MC252 vs. MC352
I'm looking to purchase one of these McIntosh amplifiers-preowned. They are approx. the same price (<$3K). Outside of power (250-wpc vs.350-wpc), which one sounds better? I'm planning to run a Mark Levinson 390s (CD Player w/built-in vol. control) directly into the Amp., then out into a pair of Wilson Duette speakers. Any guidance would be greatly appreciated. Again, sound quality not quanity, is most important.