Klipsch Heritage Range

I had the heresy iv for a few weeks to audition and unfortunately was not happy with them. They are highly rated by the likes of Steve Guttenberg and Andrew Robinson on yt. I'm not saying those guys know what's the "best" but they have raving reviews if you have to time to watch. Personally I found the sound too forward and in your face. They are not a neutral pair. I actually found them very fatiguing which those two reviewers above both said the exact opposite. I found the midrange to be most lacking. I was also very distracted by them being placed floor level so I could not stop feeling like the noise was coming up from the ground rather than straight into my ears. The one big plus is their sensitivity which is just unmatched in the industry. 

JWL - when you had the IVs, what amp were you using, and did they have much time on them prior to your two weeks?

The IV sound more open.  A little less forward.  I think the new mid driver is much better than the III driver , very detailed.   Vocals are much more intelligible.   Tweeter / Mid coherence is improved

I did not spend much time with the III.   They were unavailable so I just left a deposit to secure my trade on the IVs and they called me when they arrived ..... I bought the IV sight unseen.

@jwl244

Strange. 
Which speaker/speakers did you compare with?
Which amp did you use? 

I got the Heresy-IVs back in late November. When I started to go down the path of picking a new speaker, I had another speaker maker point out some of the issues with my room so I planned to treat the room around the same time that I ordered my IVs. The Heresy's came, and I had some of the same experience as @jwl244. 

Then I started to treat the room - I added diffusers on the ceiling spaced out between the speakers and the listening position. I added some diffusers to the front wall. I move the carpet. I replaced some flimsy window coverings with thicker, dual cell blinds. I added some art to the walls. Everything changed. I made a few other, small changes, moving some of my better (more neutral) cables back into the core system. 

Then, I really spent time positioning them. The difference between when I first put them in to now has been remarkable. I liked them at first but felt really unsettled about them. Now, I just really really like them to the point where I forget they are there and just find myself fascinated by the quality of the music. The ceiling diffusers moved the sound stage up, positioning made it wider and more engaging. 

I still have my LS50s - they scratch a different itch. And, like one of the other posters, I ordered a Decware a week or so after the IVs and in a few months will get to play around with that. I find that the IVs have done exceptionally well with the currently playing LTA Z40 (but what wouldn't), the Schiit Ragnarock, and the Rogue Sphinx. The Sphinx and Heresy combo is a little noisy for my taste, though, when nothing is playing. 

Music - a little of everything but not so much classical. Nick Cave's new 'Litanies' is playing in the background as I type this, and it sounds magical.