Khornukopia

@HenningO It would be nice to find a direct replacement part but, if Klipsch is out of stock, you should search for an acoustically compatible tweeter with 96db sensitivity. If it was me, I would build a bracket that MAYBE attaches to the back of the speaker cabinet and can support a tweeter above the top of the cabinet, or a bracket that attaches to the wall behind the speaker and reaches directly about the Palladium and mount this tweeter Aurum Cantus G2Si Ribbon Tweeter (parts-express.com), or a Radian LT 2.2 (and LT 2.2WG waveguide), or something similar.

I borrowed this post about an AK-5, by @mikebse2a3 from a while back. It is good guidance but, try to find some pictures of the OEM AK-4 and study them.

I don't see any new models, but while browsing saw this special offer that some folks might be interested in. https://www.klipsch.com/spend-999-get-a-free-pair-of-t5-ii-anc-earphones

That is the attribute that attracted me to Klipsch speakers during my early years.

@babadono , I'm impressed with all the acoustic treatment you have shown in this thread. Big improvement to the sound quality (I am willing to presume) makes it worth all the effort.

I should had said K-401, the decades old upgrade to the K-400, as noted in the Klipsch Heritage Series Historical Reference Data. "Nov 1987: The Aluminum K-400 horn was replaced with the K-401 structural foam horn resulting in slightly improved distortion figures."

It will be interesting to see if there is an upgrade to the K-400.

If I lived that nearby, I would have visited several times since your post. If you haven't been yet and do see this post, here is an upcoming event.

Thanks for the info. Better pictures over there.

Stuffing the hollow spaces reduces the sheetrock resonance, which probably is as beneficial for the acoustic properties of the room, as adding the bass trap effect of the dense mineral wool.

What is the type of wood veneer you applied? Looks nice.

No pink stuff in the original interior walls. No recorded measurements that I have on file, but MCACC on screen displays at that time showed an improvement, and the audible 70 Hz nulls were greatly reduced.

I believe the DSL flat packs were discontinued.

Picture just for size perspective. Early in life, I wanted VOTT speakers. Luckily, I saw and heard La Scalas at a party.

Wish I had known to install Rockwool Safe-n-Sound into the interior walls while my house was being built. It was a lot of extra work to retrofit when dealing with some low frequency standing waves in my listening room.

Thanks. The random patterns do work the best. I had tried several different linear woodgrain patterns (not pictured), but the converging lines don't usually look as good within the horn shape. Another plus for the carbon fiber pattern is that in dim lighting conditions, the horns just fade to black. I don't see my notes for the active crossover settings on those. Last year, I switched all my big horns to the Axi-2050 drivers.

Actually, if you place them side by side, wired to a speaker selector with level adjustments, a person can compare them. Just like any other speakers.

I like it.

You could remove the 18" driver and see that the large opening is enough to fit some proper length 2x4s inside for a few cross-braces. That would be the easier way, rather than sawing open the back panel, unless you plan a complex CNC'd web style brace.

@TonyTrex57 , If you type the @ symbol, followed immediately by the first few letters of the forum member's moniker, a drop box of names will appear. When you click the selection, it will set highlighted. Then when you Submit Reply, an alert will be sent to the recipient's notification box. About your crossovers, posting your questions on the open forum will get you more opinions and the answers you receive can be seen by everyone. When you are ready to install your new crossovers, have all the extra wires, connectors and tools lined up. Also a good idea to take plenty of pictures of the original installation for reference, and maybe share (easily downsized before attaching) pictures of the new parts, too.

I added veneer to the face panels of my set. Your SVS amp might be EQ'd specifically for the SVS, but could be good enough for your new subs, since you have DSP adjustments. Yes, the entire cabinet resonates, but maybe it was designed to be a huge passive radiator?

When I compared the K-43 vs K-33 in 2 La Scalas, the difference was not very noticable at "normal" SPLs. With my Klipschorns, in my room, the K-43 sloped down at the lowest frequencies, but had a warmer upper bass response. Sometimes, I needed to switch off all drivers except one woofer at a time to focus on the comparison.

The early model Klipschorns did not have the foam edge seals on the tailboards. I like that Klipsch added seals in the 1980s and improved performance, so while these were exposed, I attached foam rubber seals to this pair.

What do you hear with more clarity, the bass or the upper end?