how effective is a compound loaded isobaric ported box? i realize that a ported box is a more efficient way to go, because you need only 1 sub, but in limited space, they sound like they'd be effective. say i wanted to do a 15 inch system, but can't fit the 5 cubes. this style of box would allow me 2 use a push pull method to do more like 2.75? other than the cost of an extra sub, and power, what are the drawbacks compared to just a normal slot ported box?
