I figured that's what you did. I'm pretty sure somebody goofed. When you look at the photos of the QS4s on the website (maybe the older photos), the tweeters are clearly different from the ones on my 4s, which look exactly like the ones on my M50s, except the side metal bits are somewhat truncated (to accomodate the small sides on the QS4s.)

I am the Doctor, and THIS... is my SPOON!