FYI, in case anybody cares, Magnepan likes to see higher current in those speakers, and the example they gave is that if a amp is rated at 100 wpc @ 8 ohms, then to have enough current output to drive the Magnepans well, they like to see that wpc # increase by 50% under a 4 ohm load, so they would recommend a 100 wpc amp @ 8 ohms that goes to 150 wpc at 4 ohms...putting the Yamaha most likely in that range...