In case anyone was wondering, here was the email: Hello Tyler, The Xcon has a single, larger magnet that's flux field is very concentrated and has a higher motor force due to the greater surface area of the magnet. For the most part, a larger single slug can have greater motor force then a triple stack of smaller slugs. The larger, steeper back plate is fully saturated and has a shorting ring. This way is much more expensive to build, but can yield a little more performance and it also does not look like every other triple stack driver out there. What else can we help answer? Thanks, Aaron SSA Inc.