120i Sound Systems

Hi Folks - got the lovely 120i here (9 weeks old) and have accidently discovered that the 4 extra floor-mounted speakers are not connected (as ordered) or aren't working. Dealer is well-intentioned but appears confused about audio technology. Has anybody had similar problem ? Anybody got knowledge (or a link) to a full tech. description of "10-speaker sound", including wiring diagram ? Thanks all.