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I believe the tests conducted provided power readings using a static load. A/V receivers such as the TX-SR800 are designed for a dynamic load (most A/V receivers are designed this way). Basically this means that all of the seven channels are not requiring the same level of power at the same time. While listening to dialog on the center channel, the other 6 channels are idle.
On the otherhand the TX-SR800 ALL STEREO mode provides L/R stereo with all left channel receiving equal power according to the signal provided and the same for the right. The center channel mosaics the L/R information. So in this configuration the maximum power drain is achieved. Naturally, the power requirements increase as the volume increases.
Anyway, I run the TX-SR800 with 4-ohm front speakers in a 7.1 configuration which is even more of a load on the receiver. The volume has been up so high that the family has threatened to leave the house. It has never shutdown on me or had any problems. I am quit happy with it.
This is not an endorsement for ONKYO. I would have purchased any brand/model (Well almost - there are models within brands that I would not consider) that would handle 4-ohms, 7.1, good professional evaluation, and a dealer willing to give me a great price.
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