I have the 1000ws. You can set the power box to 1000, 500 or 250. Then on the 2140c's you can adjust them to 1000, 500 or 250 which of course leads to multiple possibilities between the two sources of power control. The 2100 head and I suppose the 2102 do not have controls on the individual heads but rely on how you set the power source.
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