I have been reading and comparing and had a question. My AVRs book has the power output listed as 90watt/ch with one channel driven. I see alot of receiver specs listing with "2 channels diven" so would my receiever actually show a power output of 45watts/ch if it was tested with two channels driven instead of one?? and does a less resistant speaker cause the the measure wattage to go up?? Is all the "120 watts x5 = 600 watts total system power" just a bogus number to sound good and sell parts?? Im starting to see these wattage and power ratings are all over the place and very confusing.