It's not my first choice either. That's not the point. The point is that it is still a very legitimate way to set up a subwoofer, and it can be made to work quite well. Does Mark say *anywhere* that it causes pain, or is absurd or insane? No! He says it's not a "preference." Nonetheless, in some situations, it is the best or only alternative. A thoughtful person optimizes those alternatives as much as possible, which is exactly what Mark did in this situation. It was definitely NOT the "biggest mistake" as you've portrayed it.