When I was designing layouts for sound reinforcements for concerts, it was always awesome to have an outdoor event. I loved an outdoor event. But on to the real reason. Low frequency drivers are built and designed for the application needed, and the enclosures are more efficient and require less restrictions on size. A folded horn enclosure is really efficient and can be as big as needed for the application. And believe it or not, the amount of power required to produce this amazing bass is minuscule compared to the amount required for an inefficient enclosure in a vehicle with most low frequency drivers (subs) have very very low sensitivity, compared alternately to the very high efficiency of pro audio low frequency drivers and enclosures. I love big bitches.