Cool. Yeah, I just went to the Bose site, then to customer service, and then looked up the manuals for that system. Depending on which version of the cubes he has, it could be an easy connection with wires, or something slightly (but just slightly) more difficult.
If you have any questions about the wires, let us know. The easier type of cube connection would be a really pretty simple thing to construct out of regular speaker wire and some RCA jacks.
Adam