I have the Odyssey Extreme monos. I source them through a passive preamp - a Monolithic Audio PA-1. The system sounds great. I've only heard the Theils at a dealership, but I did get an extensive listen as I was auditioning CD players through them. The system was an all-Rega setup driving the Theils. They sound very nice, although I was sitting quite close to them (about 4 feet), and the Rega power amp is not in the same class (power-wise anyway) as the Odysseys. You know what they say, it's all about synergy, and I think the synergy between the Theils and the Odysseys should be quite good. One thing to note is that a lot of folks consider the Theils to be a bit bright, a common "complaint" about B&W speakers, which I have. With the Extreme monoblocks, I have never thought my B&Ws have been bright, so maybe this would also pertain to the Theils.