I modified a pair of cheap single braced X-stands to put my Yamaha MS-60S powered speakers on...when they are open, it is just wide enough to hold the speaker securely, and they are exactly at ear level when I am seated.

They aren't too high to be unstable (or dangerous), and I set them up a bit behind me and about two feet away (that varies with stage size) from me on either side.

They fold up/set up in seconds, and I have an old keyboard gig bag they both fit into, making transporting very easy.

I'm sure you could use any type speaker, including old Roland Cubes (great sounding and reliable speakers, by the way, Fran..I had a pair many moons ago).

Ian