Will this kill an amp?

I need to power my new center channel (Revel Voice) and am trying to decide what to do about amplification. My fronts are already covered with monoblocks and I do not have two rears due to the layout of my room. Setting up rears will require wall cutting, etc which will happen this summer. So in the meantime...

I have a Proceed AMP3 I'm not using, can I use it to power the center without connecting speakers to the left/right? I was under the impression it was a bad thing to turn on an amp not connected to speakers.