Jl 10w0- 3 pieces – 4 ohm ?

hi saw this at ebay:http://cgi.ebay.de/ws/eBayISAPI.dll?… and ask me now how he comes with 3 jl 10w0 to 4 ohm when he switches them parallel or in row? (see picture and text) after all he has only 1 cable to the end stage, so are all connected. can one explain to me ? I definitely don’t come to 4 ohm, no matter how I turn it and turn it. thank you 😉