"
A cool thing about horns is that they can increase the effective power capacity of a driver (remember a 300 Watt driver can handle 500-600 Watts on a 50% efficient horn).
This output corresponds to about 400 acoustic Watts per box which is a very significant energy.
The stack of 6 should produce about 3.2 acoustic horsepower without exceeding Xmax.
"

;-)

it makes sense if the energy is being transferred into sound not heat..light a more efficient light bulb-more light less heat but same power in and out in total..

/end simplistic post

:-)