Depends on your speakers.. If they are very efficient probably 93 db or better, and a 8 ohm load or better you may never break a sweat.
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Hmm, that should get some pretty decent temp out of the fins than.. Not sure, I had a 5800 series 10 years ago, it would get a bit toasty with 90 db 4 ohm type speakers, but again it was in an enclosed cabinet.. So it might not get too bad with the newer model 5802 if it is just sitting out in the open maybe they will not get too bad unless driven at very hi volumes.