My X3800 seems to handle my Martin Logan Sequels (L-R) + Motion 6 (Center - 4 ohms) just fine. The plot below is the impedance curve of the Sequels. They are below 4 ohms from 50 - 600 Hz (~2.6 ohms @ 400Hz), then below 4 ohms from 9 - 50 kHz, below 2 ohms from ~ 17 to 50kHz. I'm also driving 4...