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Is the Denon AVR 790 (90 watts per ch) under-powered to drive Klipsch RF 82's (150W, 600W Peak), Klipsch RW 10D, Klipsch RC 52, Klipsch RS 42 ?? Is the Pioneer VSX 9040 TXH (110 watts per) that much better?


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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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