Disklavier

I was wondering if there is a picture on the web or somewhere else of 
the ports where one would hook up external speakers. I am specifically 
looking for the Pro model. I don't know if there is any difference 
between a Pro models ports and of a regular model. I'm thinking it 
could help inform me of how the speakers and a sub could and would be 
hooked up and what kind of options there is available.
Thank you, Jeff