The double amp feature does nothing to increase the power output, it simply allows the lower frequencies to be played via the same output wattage that is available to the mids and uppers. It will cost you more in that you also need to buy more wire which is why some call this Buy-wiring (Bi-wire) a speaker.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70