matthijskoopmans wrote:
> Onkyo SR 805 home theater amp 

> According to the manual, it draws 870 Watts of power... 

That is consistent with the online specs, it draws 9 amps at 120V.
I assume this is max, not typical. That is a ton of power, it would heat 
your room.

> I have asked around if a UPS would work

You could try turning off the fridge...

One might work, if you get the right one. Sadly, computer oriented UPS 
have terribly tiny amounts of information. And many of them put out only 
crude waveforms (square or triangle) waves when they are generating A/C 
from their batteries, which will sound terrible in most audio gear.

If you can get one that is "always on"
http://www.pcguide.com/ref/power/ext/ups/typesOnLine-c.html
it may work. You need one that generates true 'sine wave' power.


Less likely to work, but easier and cheaper are  "line interactive" mode,
http://www.pcguide.com/ref/power/ext/ups/typesLineInt-c.html

And of course there are special Audiophile power cleaners that cost as 
much as small cars that will do the job.


-- 
Pat Farrell
http://www.pfarrell.com/

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