RF82's have a sensitivity rating of 98db's. In other words it takes 1 watt of power to reach 98db's. For every 3 db's of output added you need to double the power so it would look a bit like this...
1w = 98db's
2w = 101db's
4w = 104db's
8w = 107db's
16w = 110db's
32w = 113db's
64w = 116db's
128w = 119db's
The Denon AVR 1910/790 when running 7 channels will likely not put out much more than 40w's of power but even if it did put out all 90w's to 7 channels it would mean very little difference in overall output as you can see that going from 40db's to 90db's would mean an increase of maybe 3 or 4 db's.
Even if you had the Pioneer receiver your overall output would be almost identical.
If you like the features of the Denon then I say go for it, especially with speakers that are so efficient.
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