[quote name='JTUK' timestamp='1395572767' post='2403739']
I make that 1800w..???
[/quote]
If it is the one in the link then 1200W, I think. The Elements kit is a mixture of Active/Passive components, so if you had 2 Bins and 4 tops, 150w each but passive feeding off the bins, you end up with 1200W. If you had 2 additional amps, the ones that just plug in to the top of the bins replacing the pole you would get an additional 300W per side.
The Active bins on their own are rated at 300W and can feed 2 passive tops, (150W each) or a passive bin, (300W), to get the full 600W.