Sonofjim,
One additional tid bit I learned from Richard about the new 7As which hasn't been mentioned. The midrange cone is formed from balsa (by turning it on a lathe), and is then reinforced with carbon fiber. This forms a kind of truss which is very light, yet very stiff. It has the properties of being more "pistonic", e.g. responding quickly, having less troublesome breakup modes, and being internally better damped when breakup does occur. As I understand it, this midrange is one of the upgrades that would be available to original 5A owners. Seems like this has the potential of being quite noticable.
One additional tid bit I learned from Richard about the new 7As which hasn't been mentioned. The midrange cone is formed from balsa (by turning it on a lathe), and is then reinforced with carbon fiber. This forms a kind of truss which is very light, yet very stiff. It has the properties of being more "pistonic", e.g. responding quickly, having less troublesome breakup modes, and being internally better damped when breakup does occur. As I understand it, this midrange is one of the upgrades that would be available to original 5A owners. Seems like this has the potential of being quite noticable.