I have a question about impedance. I am toying with the idea of building an Adire Audio kit, and I did some posting over at HTT but one of my questions kind of went unanswered. If I build two 281s for mains and a sealed 281 center and kit 81s for surrounds, then I will have three 4 Ohm speakers and two 8 Ohm. My amp (Yamaha RX-V1200) is rated as being able to have two 4 Ohm mains and three (or 4 if you use the rear center channel) other 6 Ohm speakers connected at once. My question is, how bad will it be if I use three 4 Ohm speakers and the rest 8 Ohm? Will this be a similar load as all 6 Ohm speakers or two 4 Ohm and three 6 Ohm speakers? I dont want to burn up my amp, but I would think the Yamaha would have sufficient build quality to handle the load. Any ideas?