Plain and simple, the iW4 is just nuts. It really is. Something about the three-way, dual woofer with the mid-tweeter cluster from our Classic series probably has a great deal to do with it. So does the high-power handling capacity. As does the fact they fit between 16" studs either horizontally or vertically. But what really drives these suckers through your roof is the fact that they go in a wall at all. The sonics are just nuts. It’s almost hard to believe that sort of detail and accuracy coming out of anything, let alone a wall.