Klipsch Cornwall IV

riaa,
Thanks, but be careful, I would be tempted to take you up on that offer!

Donsachs 
Thanks for your feedback. The Corn IV are amazing speakers, stock, once you get at least 50 hours on them, and they really start to open up at around 150 hours. I will eventually change out the caps and resistors, (and dampen the mid and tweeter horns with Dynamat), however I am first going to add in a second pair of Cornwall IV’s and stack them......yes I know, sounds crazy and major league over kill, however one doesn’t know till one tries.....I realize there will be some “Comb Filtering effects”, and imaging may suffer, etc. Should be interesting at the very least .....Anyway again thanks for your work and feedback.
CHEERS.......

If you stack them so the top speaker is upside down then the tweeters will be close to each other and less comb effects.....a D’appolito, if you will.  You could put some thick felt between the tweeters and that will eliminate some of the interaction between the two.

The most simple mod is to make sure you connect your speaker wire to the mid high terminal and make or get a serious jumper to go to the woofer terminal. The stock jumpers are crap.  Bi-wiring would be even better.  Just use some cheaper thick wire for the bass as a starter....will blow your mind.

@donsachs , Fascinating report on your crossover upgrades, Don. I’m tempted but don’t really have the skills. You should offer a drop in replacement crossover board! I’d certainly buy it, and I’m sure many others would, too. Just a thought. Well, more of a wish!