Klipsch Heresy IV

You really do have to have the front end sorted out to make the Heresy IIIs really sing as they're very revealing of anything put into 'em...they're great tube tone and wire quality (or characteristic) indicators...I imagine the IVs have the same basic needs.

Absolutely. In response to Mofojo’s post, I have to say, “Yes”. The port seems to offer faster response vs. a passive radiator. The “mumps” added to the Forte midrange horn seem to be an attempted solution to a problem which the Heresy does not have. Set about 2’ from the rear wall, toed in slightly, and seated about 12’ back - “Holy crap, Batman !”. The Heresy IV created a three-dimensional, immersive experience. I originally wanted a pair of Harbeths, but opted for Klipsch Heritage due to their legendary efficiency and much better price point. I was not expecting finesse, but it is absolutely there. Pricing was $2,650 for the pair and an excellent fit within a $10,000 “starter- plus” system including: 
- Deep Core / Furman power,
- Rega P6 with Ania MC cart and Aria stage,
- Primaluna Prologue Classic Integrated,
- Bluesound Node 2i,
If I upgrade in the future, I would likely give the Klipsch speakers to an adult child - true heritage quality and sound. From a middle-aged former rocker, these are decidedly not my old Cerwin Vegas 👍🏻👍🏻👍🏻

Quote: "  ports require a smaller cabinet than sealed "
This is incorrect.  You can get away sometimes with a smaller box using ports because of tuning capability, but.... and a big but.  For ANY woofer in its perfect sealed box,  its perfect ported box will be larger.  

I really like my Heresy III. , one thing that I like about them is they are not ported and can be placed close to the rear wall.....  I would love to hear from a current H3 owner who demo'd the III and IV side by side.   

Yes-given the same woofer-one that had a EDP that lends it’s self to sealed and ported boxes-the ported box will always be LARGER.
Amazing how many assume just the opposite.
I would certainly recommend any audiophile to get and read a copy of Dickason’s Speaker Cookbook.
Also Weems-designing and building speakers.
It keeps you away from the huge misinformation on speaker design, and implementation.
I prefer sealed myself-overhauled my ESS AMT3’s with woofers, and sealed the boxes (trial and error-even with woofers that had the correct Theil Parameters to work in the box-some integrated poorly with the supporting drivers).
But frankly, making a correctly ported box, without expensive testing equipment to get the tuning spot on, is darn near impossible. Damping a sealed box, by ear, with aid of a simple damping tester is much easier.
I assume Klipsch certainly tuned these with the proper equipment-no doubt in my mind. The Heresy is their best selling Heritage model, has been for years, and help keep them afloat during the rough years.
Good competition for the reissued JBL’s.
IMHO the biggest news is the new midrange, updated tweeter horn, better, and more even dispersion and updated crossover. As Klipsch mentions-smoother, less peaky response, and better driver integration.
All issues that reduce it’s marketability.
I haven’t hear one yet-but remember the III’s very well-should be interesting.
Just guessing from my memory-but these changes clearly address the issues I had with the Heresy III’s. The bass frankly wasn’t one of them-but I never played bass heavy material @ high volumes either. I would rather have tight bass-over extended boomy bass. But there is still away to get tight bass with a port-not sealed but close.
Each design decision had tradeoffs, particularly with bass.