I have a DC (a Jet DC1100) that has 1 motor, about 1,500watts. That handles 1100 CFM, which is about 500 liters/sec. The unit you describe (based on motor size & air volume)sounds like it is designed to provide suction-power more like a very large vacuum than a dust collector. As a reference, the Clear Vue's run about 1400 - 1950CFM (660 - 920 l/s) . Their motors are 5hp (a bit less than 5000 watt).
With dust collection, its not so much the suction power (although you need some) as the volume of air moved & velocity. Standing in front of the ~150mm impeller discharge hose will move paper 6 meters away. A DC impeller ranges from 250 - 350 mm in diameter.
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