Running non stereo for keyboards is questionable......Get a couple of great light weight powered speakers and put them on one dual pole mount - works in every room with great stereo sound. I have my heavy K10s up high and they sounds terrific!

https://www.google.com/search?q=dual+pol...366&bih=637

I have the 902B and just ordered the LD System one to stretch it out a bit more....