Klipsch’s Tractrix® horn features a circular throat around an advanced titanium diaphragm tweeter that transitions into a square 90º x 90º mouth.
This unique shape provides a cleaner, more efficient transition of sound waves into your listening space. The result is a wide listening "sweet spot" with precise placement of instruments and vocals.
<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>
The way it is made, a wave guide is all you can do. That throat is the first reflective surface of the wave.
Foam on both sides of the throat, left and right, start at the outside and move in, adding strips. 1" tall 1" wide. When you get close go to 1/2" wide strips, to fine tune it..
Remember not to dense a foam, you can tinker with that too...
Position will REALLY make a difference then.. Toe in or out. and vertical, camber/caster...
I suppose you could pin point it more so with vertical top and bottom foams.. Highs might get a little hot though. Tone control is an option.
TURN down the bass while doing this... that throat is a collector of distortion TOO. the foam will help there too.
It acts like a weir, or a phase plug in the sub/bass and bass coming back into the throat off axis, more so.
After the tweak, add the sub/bass back in..
Yup.. I’d give that a shot, cost... mmmmm 2 dollars.
I call that a stocking stuffer or toilet paper... your call. :-)
Regards