You're all correct chaps - it is parallel & not series.
Perhaps Matt could edit his post & change it to 'parallel', if he wanted to, as it's a very informative post otherwise..........trouble is, it'll make these posts since seem silly to anyone who reads them afterwards

Done - sorry for the confusion... when I thought about it and then did the diagram, it was obvious really...
PS - it won't look silly with this post on the end...

or perhaps he could copy an paste it in2 the how2 section? or allow some1 else 2?
Any mods feel free to make a FAQ thread with this info
As I said - I don't know everything there is to know about this stuff, It seems BigJohn knows far more than I do....
I'm only saying what I know / have learned through years of working with PA speakers and DJ equipment.
PS - impedence has always confused the hell out of me, I kinda know the basics but when it gets to more technical stuff I'm stumped....