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Need a couple of these stacks

I tend to agree with this but nothing wrong with utilizing what you have on hand even if just experimenting or having fun. People been doing this forever, believe I've seen some cave art depicting it somewhere.

Putting the Heresy's on top of the forte's upside down will give you significantly greater results. People will still scream and shout about how wrong it is but I've done this several times and it works great, at least with like speakers. The early Heresy models have a lower sensitivity than the forte so that may have a negative impact but not sure how much. Either way, stacking them trying to align the drivers in both cabinets should improve the sound by quite a bit.

After living with the Forte IV's awhile I tend to agree with the first video review- they are magnificent speakers. When I introduced my Carver RAM 285 to the system the amount of low volume detail was brought to a whole new level, just incredible. When he speaks of harshness on lesser quality recordings I found the forte's to be much more forgiving than my custom KPT-335's. The forte IV's have set a new standard of excellence in my listening room.

I just spent a few minutes looking through the advertisements and PDS sheets for the entire Heritage line and did not see "Audioquest" anywhere. https://www.klipsch.com/products/heresy-iv-floorstanding-speaker https://assets.klipsch.com/product-specsheets/Heresy-IV-Spec-Sheet-v04.pdf

Two things I'd start with already mentioned here- 1) Loudness button or change in tone controls. This one is easy and costs nothing but a little time to experiment. You might find you can significantly improve the situation with just some minor adjustments. 2) Fresh capacitors if you haven't updated them already. If you still find things lacking or want to improve some more I'd look into some quality separates. If your Receiver has pre-outs you can start with a quality (new or used based on your budget) 5-7 channel amplifier.

Not everyone has 10g's to throw at filling in the bottom end of their speakers and some that do might not have the needed real estate to accommodate a sub larger than their LS.

I have a few videos of this guy

The Chorus 1 came with a sheet of plywood as a brace inside the riser making it very stout- not sure why they left it out on the CH-2.

Interesting article but it is dated- Klipsch has moved on from this style tweeter a few years ago now and have switched to Celestion drivers.

They appear to be the model H with the k-1000 mid horn very early Heresy

The AA crossovers are very simple and easy to re-cap only 3 caps per side on a nice open spread out board. You could order a cap set for a very reasonable price either through JEM or any of the online part suppliers. I agree the Sonicaps can brighten the sound quite a bit, I've done several of the Chorus crossovers over the years and the initial impression is very clear and detailed but they can get fatiguing at moderate levels over time. For the price of new drop in crossover replacements from the 3rd party vendor you could buy several sets of different caps to try out or just keep it simple and go with the factory recommended JEM.

Which model speaker / crossovers do you have? Some of the early Heritage models are very simple to re-cap.

Have you contacted the manufacturer, Atlas? https://www.atlasied.com/pd-5vh

They sell "kits" with a measured amount for the size voice-coil: https://www.simplyspeakers.com/ferro-fluid-speaker-repair-kit-mi-ff100.html

Google "baffle step compensation" there is science behind it. One would have to think that the engineers at Klipsch would have accounted for this in the crossover design but no doubt expanding the width of the baffle can dramatically alter the sound.

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I'm selling a like new pair of Beyma 15" woofers these things are beasts 4" voice-coils high power handling with usable frequency response from 30hz-4khz. I had these in my Chorus II cabinets and they are very articulate- strong bass output with a very detailed lower midrange. My plan was to go active and use DSP but never got that far. I bought these from US Speaker and after tax and shipping they cost just over $1,000. I'm asking $600 and that includes fully insured shipping to the lower 48. PP friends and family or US money order. Pictures are of the Beyma woofer next to a stock Chorus woofer for comparison. https://usspeaker.com/beyma 15P80fe-1.htm

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I have a single forte II passive for sale, a little dusty and one tiny tear in the gasket on the outside edge as pictured. PP friends and family, cash on pick up or US Money order is accepted. Price includes fully insured shipping to the lower 48. PM me if interested thanks.

Sounds to me like you may need bigger speakers if you're listening loud enough to cause damage try and find some Chorus II's if listening loud is your thing or maybe some of the Pro models; KP-301's or KI-362's- I believe there's a set of 301's in the garage sale section right now, not sure where you're located but these would do the trick:

I helped a member here years back he had a pair of KLF-30's with Emotiva amp and pre and complained about not having any bass. He was semi local about an hour north of me so I loaded up some Sunfire gear amp and Pre and we did a side by side comparison after I checked all of his wiring. The difference in sound quality and bass impact was not subtle- after about a half an hour or so he bought the Sunfire gear from me. We even tried the Emotiva Pre with the Sunfire amp and Emotiva amp with the Sunfire Pre, each time with either Emotiva piece the sound quality went backwards.