The above quote probably is the key to another reason why Wayne is using the drivers in question. Wayne's designs aim at reaching a true high efficiency/sensitivity. This is virtually impossible with conventional hifi drivers, since these are usually aiming at making deep bass possible from small(er) boxes. This in effect excludes the possibility of high efficiency - it's simply a matter of the laws of physics. Putting it in simple terms (a bit oversimplified, actually, but...): If you wanna have a 10 times better efficiency, & still reach the same level of bass, you have to accept a box that is 10 times larger!