Hi there Terry,
I originally had the room dimensions on the drawings of the room layout, but took them out for the sake of simplicity. I'll put them back in.
The room is 5.5m wide * 4.4m deep * 3.175 high. It is open to a hall that is 4.1m long * 1.4m wide, same height. This gives a volume of around
90 m^3
The backwave will be contained in an adjacent room 3.9m wide * 3.9, same height, for a volume of around
48 m^3
I suspect I've gone for a bit of overkill, but all my previous subs have sounded great running flat-out. I wanted something that had enough headroom to "set and forget"
Given that your area is double the size of mine, I doubt four drivers will do it for you. I'm sure norpus will show you the light...
regards
Collo