Yes, you can use the non-powered monitor or main stereo outputs on the power rack. The only difference in the powered and non-powered version of the KPA is the one extra powered output. All the other outputs on the back are identical.
Thanks ! That solved my problem I'll just get the powered rack and then just bring along my power amp when I need to go stereo. AWESOME 
I have the power head and love it but, if I needed stereo I would have opted for the non powered head. I guess if you don't need stereo all the time the powered kemper makes sense. You have everything in one package (that's why I bought it) when you need stereo just bring the power amp and run the power head that way.
So my question is. If i go with the Power rack and then decide I need stereo can I use an external power amp?
