hmmmm..

Sound to me like the person at Infinity who "sized/named" the drivers was a man. Men are always exagerating the size of their woofers!(heh heh)

Well... perhaps it's like the sizing of TV sets and computer monitors. The actuals vary somewhat from the published specs. At least in monitors they usually state a viewing size (vs the actual tube size)

I think that in speakers, the stated size is nominal and usually includes measurement to the outside of the frame where the screws/bolts go. Check out a 6X9 or a 5X7 speaker for a car.

Randyman