I've seen the measurements!
This is your original quote:
The measurements.
Yes I did. Those are the measurements.
They measured OKAY. Poor for a 27 thousand dollar speaker.
They played the midrange through beaming. Look at the off-axis.
We are talking about the SS AR1. Well, I was when I replied to your post.

The AR1 is $17,000 more than the Pioneer S-1EX.
Those drivers can be purchased and one can build a better speaker for less, IMO.
First of all, define bright please.
Secondly, what, from a design perspective, makes the KEF bright?