Klipsch Heritage Range

Right.....they are fun and engaging .....   I miss my H3,  I would have liked to keep them but ......     

I have spent a little over a week with the Forte IV and it is quite good.  I don’t listen to classical but they have impressed me with any material I’ve thrown at them.  I don’t think they have the pitch definition of a Cornwall down low but I turned my sub off the first few nights of listening. They sound BIG,  and with great material sound extends well beyond the speaker.  I’m trying not to listen to them too critically because number one they are so fun to listen to and (2) I’m trying to get away from analyzing equipment and enjoying the music.  
I think these speakers will let me do that.   The midrange driver is much improved,  I listened to IIIs and liked them, I would have taken them home if they had them I Cherry. But  I’m glad my timing, and luck allowed me to get a pair of IVs.  

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.

I have been enjoying the Forte IV for about two weeks and am pretty happy with them.   It is not a marginal improvement,  the new mid driver really is nice.  These speakers sound fantastic with any material.   

Unfortunately I don't listen to classical so I can't answer that but they did not disappoint when playing material I thought most  speakers struggle with.