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Sound is really loud, no worries there. I cant even turn it up past a quarter of the way while setting infront of it, its way to loud, so that was good. There is no Power ON/OFF button. I got a reply from the Klipsch folks themselves, it looks like leaving them on & not worrying about them is just what they had planned all along.
Maybe this information will help others in the future when more people get the newest Klipsch Promedia 2.1 speaker systems (without On / Off Power Switch).
"Hello I am sorry to hear about the problem you are having with your system, however it is safe to leave those on, when they are not being used they take up less then 1 watt of power. The new technology and amp system it will not damage that.
What's great about it: VERY Loud
What's not so great: Right speaker with the volume adjustments seem to overpower the left speaker a little