.....Spider, I suspect the Onkyo will be fine....they are a recognized name for sure....when you parallel two 8 ohm speakers, a higher resistance load of 4 ohms is presented to the amp section which results in more voltage required to overcome the resistance and the amp section kicks more watts and heats up....but when you wire two 8 ohm speakers in series, the resistance load presented to the amp section is lessened to 16 ohms....your amp needs less voltage to keep up volume-wise with fewer watts being needed and the amp remains cooler....there could be a combination of these two types of wirings to the output posts in 5.1, 6.1, and 7.1 surround receivers to keep the resistance factor to the amp sections, of which I believe there are two, at an acceptable level of the resistance presented to them for longevity of the unit via less heat, I don't know....Buck said the best settings to him were "stereo", and "seven channel stereo....guys, seven channels of discrete signal source would need seven independent amp sections....current sources only input two discrete signals, left and right....DVD players, CD players, tuner sections, and even phono's included.....