worth the jump to Cornwall IV's from Forte IV's?

Volti Razz speakers are about the same size as the Forte IV so I dont know what the "dolphin" guy is talking about.. Lascalas weigh twice as much as the Cornwallls (200 pounds) so keep that in mind if you live alone. Floor space isnt the only consideration. Forte are a pain in the ass to set up properly and are the least forgiving speaker in the Heritage lineup. Poor recordings (like ROCK) will make themselves known. If you can afford the Volti’s its a definite step up from the Klipsch. Better parts, crossovers/wiring etc and you dont have to do any work to them to make them sound great. All Klipsch speakers need Dynamat placed inside the cabinet to yield the best results. Ive had ALL of the Speakers mentioned above except the La Scala’s and Heresy.

Check out Andrew Robinson's channel on Youtube on this very topic:

I agree that Cornwalls don’t plumb the depths but they have very defined bass down to the upper 30s. I used subs with mine, but they weren’t necessary to get very satisfying bass. And as @mwjones stated, the bass of the LS can be surprising too. I can certainly see why some people don’t use subs with them depending on your musical taste.

I’m thinking of upgrading from heresy to forte, what is your specific feedback on this? In my other room, I upgraded from cw to la scala-oh my my!!! La scala are the only 3-way horn loaded speakers (with k-horn), and it’s so unbelievable!!! Do it.

Aside from being an incorrect blanket statement, do you see your second sentence is a non sequitur to the first?

"All Klipsch speakers need Dynamat placed inside the cabinet to yield the best results. Ive had ALL of the Speakers mentioned above except the La Scala’s and Heresy."

My Forte IV, La Scala II (two pairs) and Heresys never resonated or needed anything from me to sound great. 50 year old Klipsch (like any other old speaker) may need some acoustic treatment for best performance, but the op is discussing new speakers. I don’t think Ozzy or I have used Dynamat on our horns.

Greg makes several Volti speakers which are as large or larger than the Klipsch counterpart they are modeled from. They are great speakers in their own right.

I live alone and never had an issues moving any Klipsch speaker.

And its a problem the Forte is unforgiving for poor recordings? What the solution; buy poor speakers so you don’t notice or stop listening to poor recording? You chose.