pzannucci

It is your ears and your room. Give it a try. There are two many variables to say do it or not. 1. Toe-in 2. height 3. tilt Due to the dispersion of the horns, all the above will be key. If you are looking for bass reinforcement or reduction, #2 will be critical. It will even be affected by either milk crates (holes through them and density vs. cement blocks with corresponding reinforcement vs. loosing the floor.

I need a "Lost" emoji.

Newer version of what? Looks quite a bit older. Like the integration :-) What dollars is that amount in? Looks to be one of those speakers that starts out as a one driver system, then you add parts at your leasure.

JBL tweeters, but I would bet that is it.

Built my own for my RB5's. Attached pic for ideas. That height is not easy to come by.

Looks like a jbl Ti tweeter. Someone must have gotten a bunch of parts though did a good job on the enclosure from what we can see with the picts. Wonder about the crossover.

Use a good rubber treatment but don't get it on the paper cone. It wouldn't hurt to use this periodically.

Precisely why I stated that. Careful with what you hope are in the boxes.

I am referring to the actual driver configuration. You are correct there are a lot but a number of Heresy 1's don't have k-77 and k-55v for the driver complement. Need to be careful of the cut over to the other midranges if you really want to seek out that specific configuration. An aside, to me the IIs sounded more balanced. Forte's still if you want any bass.

Good luck finding that configuration anymore. Most have the newer (non-k55v) mid. To me the Forte or HII is more balanced.

KLF-30 is great the way they are. Some tightening up on the cabinets, and possibly tweeter diaphragms, you should be good. You can do the woofers and such but the problem is you may or may not like the outcome. BUT you've already done the investment. Too late. Change the tweeter if you must and brace the cabinets better, then decide. Cabinet bracing is a game changer. If you put in the new woofers, you will still need to brace the cabinets....

KLF-20 is a great speaker. Could use some crossover work to clean it up or if changing to a Ti diaphragm, require fixing the crossover between the tweeter and midrange since Klipsch designed the KLFs to take into account the natural roll off of the mids. You do want to know what you are doing when replacing anything. Different may be better or worse. Depends on your room, equipment, and EARS. @Deangwill take care of you if you've discussed the changes with him.

Very good.

Would love to have one of these: https://www.stereophile.com/content/technics-su-r1000-integrated-amplifier

Those woofers definitely don't go with that vintage of domes.