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I did not mention nuance because I assumed you'd get that right!

93dB and 4 ohms would be interesting. Works better with the decent-but-cheap chip amps. I was looking at that target for a DIY design but 4 ohm pro woofers are scarce. My thought, after giving up on 4 ohms, was Lavoce DF10.144LK on an EV ELX112 clone, Lavoce WAF123.01 or GRS 12 PT - would have...

You probably know this better than I do, but for clarity's sake: "every halving of distance means you can turn it down 6db" - true above Schroeder. Below, it is complicated, but more true for dipole than monopole. I think I have that close to right.

If you put a dipole sub close to you, it's output near-field is much higher, but total energy into the room is low. Dipoles up close: https://musicanddesign.speakerdesign.net/Dipole-axis.html Try one of these 15" in a frame right in front of you (maybe a foot-rest?) or behind you...

Darn! Sounds fascinating.

Not to speak for Amir, but a couple of possible reasons occur to me: Some designs are broken and need to be identified Tech is interesting and is fun to measure, even to a level that is beyond completely transparent. Good engineering can be admired, even when it makes no practical difference...

A caution regarding undercoating materials I have heard but cannot vouch for is that they can outgas solvents which can affect the drivers.

Thanks, that indeed covers it. I can't tell how much to ascribe to placement vs. material, but looks better in lower frequencies and worse at higher.

Sorry I was not clear; my fault. I'm proposing the same mic position as your other tests but moving the damping material closer to the center of the cabinet. Since the air will be moving more there than it does close to the wall, the same amount of damping material may be more effective. In the...

Do you have an easy way to test the denim (for example) in a higher velocity location than the cabinet wall? Somewhere near the middle of the cabinet, or some odd dimension away from the walls?

In Israel, can you get Morel drivers cheaper? Do they have kits available? Or, is this available were you are? https://www.audiosciencereview.com/forum/index.php?threads/hivi-3-1a-diy-speaker-with-sehlin-mod-review.15802/ This plus a sub is also in your target price range.

Yes, I'm planning to use around 2" of sound absorption covered with acoustically transparent cloth on all cabinet surfaces to minimize diffraction. The sides and back will essentially look upholstered, saving a lot of cabinetry effort on appearance. I was thinking of Sonic Barrier for the front...

Source for the woofers: https://orevox.com/12inch-Carver-Amazing-Loudspeaker-Paper-Cone-Woofer-Driver They do a production run every now and then and they come back into stock.

Any thoughts on damping that has a mass-loaded layer (such as one of the Sonic Barrier 3-layer materials) applied to the outside of a cabinet? Might it reduce transmission of sound from the cabinet walls? I admit I am unclear on the propagation mechanisms of sound from cabinet wall vibration...

Another reason to stick with low Q corrections is that the resolution of your gated measurement will limited by by your gating window.

Lotus did have some involvement with that car, but only for the suspension tuning. However, the design was by Giugiaro, and one of his better efforts.

Most interesting dash I had was a circa 1985 Isuzu Impulse Turbo (can't recall the exact year). It was a fun and beautiful car until the head gasket failed. The control pods to the left and right of the wheel could move. Photo is of JDM version, mine was slightly different:

Also see: https://www.mtg-designs.com/tips-tricks-tests/waveguide-shootout Many of the waveguides tested are NLA or one-offs, but some look quite interesting: Electro-Voice ELX112 Horn Pi H290C

Might want to try some 30PPI reticulated foam completely filling the horns (should extend slightly past the mouth) to reduce what Earl Geddes called Higher Order Modes: https://www.swisstropicals.com/filtration-shop/poret-foam-shop/ It cuts cleanly with a hot wire or an electric carving knife...

The silver honeycomb was an earlier version, I think originally made by Sony. It was replaced, as far as I can recall, by a better version made by Tonegen (also the OEM for NHT), of which the Orevox is a copy. I think Orevox also had the honeycomb at one time. You can do better than the...