Congratulations on the khorns. I too have 1993s! let me start by throwing my two cents in about your specific questions and then add a few lines:
- Should I try to construct the 'false corners', at which point I can experiment more with toe-in?
Toe in is worth a try for the imaging issues and should improve a bit the bass performance, I got some amazing improvements in spatial effects when I toed mine out just a bit, your case may be the same.
- Is the Crites crossover kit worthwhile? My thought is that I'd only be benefitting from new caps, since the rest of the components look basically the same. For $400, I could probably source more exotic caps (V-Caps maybe) and replace them myself. Thoughts?
I didn’t get much benefit from swapping upgraded crossovers (in my case some ALKs) not that they were bad sounding but, in the end, the original AK3s sounded really good, I would only swap out or "upgrade" if you have evidence that a cap is leaking or out of spec. I even tried an active crossover for a while and in the end...went back to stock.
- Is the $1000 Volti XO the way to go, from Greg Roberts? At the Volti website he seems to be backing away from A La Carte and pushing a complete rebuild kit costing $4K. I can't justify that, or anything close to it at this point.
My gut feeling is...no. there are some people who have swapped out components; speakers, etc. for a benefit but think about this only if you really are thinking of DIYing a speaker and in that case, why not just design one from the bottom up. I had a tri amped, active crossover, speaker with JBL 2404H tweeters, Altec 311 horns with 290 drivers and the khorn bass bins and went back to nearly stock.
- I may be able to move my gear off to the side of the room, but it will require purchase of a 15' pair of RCA's. I reckon on around $750 used price. Is this worth it or not?
Not sure I would do it for sound improvement, I understand the idea but don’t think it will get sonically what you are looking for in this case.
In the end the khorns have a specific sound, including some limitations in the high end that I am not sure can be resolved easily. Many here have a series of tweaks they have tried, some feel they triumphed, some admit failure. I enjoyed the more than a decade of tweaking I did and, as I said, ended up back to a largely stock system with selected components I liked best (and closets full of speakers. amps, etc.). I am currently enjoying the music more than ever and now accept some of the imperfections in my system's reproduction capabilities. I continue to audition components and systems in retailers and other homes and have yet to find anything that gives me the effortless volume, visceral impact and detail my system does (in my home, with my music, etc.). I continue to read and search for the mix of upgrades that might give me that last 5% on the top end I am looking for and for that reason follow this forum still after so many years....
But my advice is usually the same, if you like the Klipsch house sound, it is worth the time to find optimal ancillary componentry and even to try a few mods (crossover, drivers) but my advice is also to keep everything you begin to swap out and you might just end up as I did going back to stock and enjoying the music with the Klipsch house sound. But think long and hard if this Klipschorn is YOUR house sound, some find panel speakers are more their cup of tea (I was nearly there with my maggies, a subwoofer and some Mcintosh amps!). You can get another 5% (maybe 10%) more out of the khorns but if you don’t "see the finish line" from where you currently are I say change the playing field with some panel speakers, or even some big dynamic multidriver speakers.
Please keep us informed as you go through the process of deciding, many of us watch with great interest progress by others as a guide for us. Best of luck and warm regards from sunny El Salvador,