Sorry amer.
Divide those costs by two.
Incidentally the QS4 is now being made with the same tweeter as the QS8.
I'm sure from both a marketing and a cost of building perspective this is a wise decision for Axiom. They may still be selling the QS4s with the other tweeter until they get rid of the stock so if you go that route, you may want to ask (if it makes a difference to you).

"Those who preach the myths of audio are ignorant of truth."