I was able to try a magtech with my 3.7i's and it had no problem driving them, and sounded good, although a bit on the bright side. Remember that the magtech is pumping out 900 watts at 4 ohms into Maggie's. However, it's not always the wattage but the current when driving inefficient speakers. I was just listening to a 4 month old Stratos Extreme with the Symphonic line caps and Groneberg wiring (80% of a Kismet) that I picked up here on Audiogon and I'm really loving it over the magtech. And I'm only running about 270 watts compared to 900. But I'm putting out about 70 amps of current. Very, very pleased.