Experience with applying Kilmat to Cornwall IV Horns?

Cornwall IVs do need several hundred hours for best sound. Be patient and you’ll be rewarded.

no need to dampen plastic

To the OP...Enjoy ! My best, always, MrD.

Thank You all for the great advice!! I will hold off for now as the more / longer I listen to these the better they sound. 

I just completed damping a pair of Heresy III, and the client is " thrilled " at the added " cleanliness of the presentation ".....his words......

A properly designed Tractrix horn is a non band aid approach for horn issues. If your not suffering horn issues, crossover mods alone should fix issue.

Never in my life have I, or my clients, not heard improvements by properly damping horns.

I'd be skeptical you'll find damping horns in this way to be satisfying long term, band aids like this usually expose their flaws over time. I don't see issues with your equipment so I expect upgrades to crossover only would be good starting point.

I have Khorns, tried the mat thing, totally unacceptable to my ears. My extensive mods are extreme, but have paid off handsomely in long run. Not saying you need to go this far, just go for some crossover upgrades and see where your at at this point.

I covered the midrange horn, tweeter horn, woofer frames, and ports in my CW4 with Dynamat Extreme. I like the result. I also upgraded the resistors, most of the caps, and the binding posts at the same time, so I cannot pinpoint the contributions made by the Dynamat. But I can say the mods, taken together, brought these speaker to a much higher level.

I would let the speakers thoroughly break in before screwing around with the speakers' innards.  I would think that if the speakers really needed the damping, Klipsch would have already done it.  Just because a few clowns made You Tube videos, does not mean it is a good thing.

I tried damping the horns on my Klipsch and it made them sound worse.If you do it make sure it is easy to reverse.Try blu tac.