How to dampen Klipsch Cornwall IV horns for better sound. I apply Dynamat Extreme to control horn ringing and describe the sonic changes that result.

CAUTION! Proceed at your own risk. I am not responsible if you damage your gear, hurt yourself or you don't like the results you get.

Here are several precautions:
1) Disconnect and unplug your power amplifier from your speakers before attempting anything
2) Dynamat Extreme sticks very well. Consider this modification irreversible. Only attempt it if you are confident that you know what you are doing. I'm not responsible if you don't like the result.
3) Make sure not to apply Dynamat where it will interfere with a horn's proper fit into the speaker cabinet.
4) Mark the wires and the drivers so you can be sure to properly reconnect the wires when you reinstall the drivers. If you don't do it correctly, you may blow a driver, or your amplifier or have some drivers out of phase with others.

For those that may ask, here is the Dynamat I used: https://www.amazon.com/gp/product/B00...
It's an 18x32" sheet, which was enough for the midrange and tweeter, for my pair of Cornwall IV speakers. Some material was damaged from the shipping folds, but I still had a little extra left over.

Good luck and happy listening!