Klipsch Heresy 4?


I didn't realize the 4s came out until I started researching the Heresy 3s. Has anyone heard them or purchased them? What's the deal?
bluorion
My review: https://www.stevehuffphoto.com/2020/02/17/klipsh-heresy-iv-review-klipsh-steps-into-the-audiophile-r...

Some of the best speakers I have owned, and I have owned speakers up to $45k. A steal at their cost, and lifetime keepers. I used to own the III, and these are an all new speaker. 
Had them for a week and a half. You can’t do better than Steve’s review above - convinced me to give them a shot. I had the Heresy III and it was an easy decision to trade up after hearing the IV. The III was good and a lot of fun but the IV much more of what I like in the III and refined. I have ATC SCM 40 Mark 2 speakers as well and they aren’t likely going back in rotation for a while.
@stevehuff Thanks!! Great review! I'm reading and seeing some great reviews on YouTube. The bass port seems to have made a huge difference! I may have to try these babies very soon!!
I'll likely be replacing my IIIs later this year just to see what's what, as I did hear some very impressive new Cornballs (uh...Cornwalls...sorry) and Fortes recently. My IIIs are fabulous and if the IVs are fabulouser I'll notice that immediately...they'll be auditioned first of course as there's a relatively nearby shop to hear them, but I trust Mister Delgado has made some good choices with the IVs.
I've picked up a pair of IVs in walnut and now the conundrum is what to power them with.  I am going back and forth between tubes and low-powered SS, like First Watt.


What are people using for amps for their Heresy's?