Rings,Don't have to be Larry's,similar would be nice.

Parkerized steel or powder-coated steel more likely.

It's usually the penny-pinching bean counters that don't even understand a process or function that make that statement.

Rings?
Somebody still needs rings?
I wandered onto this thread because I am preparing to make a few for my needs.
Someone mentioned the need for an "top-shelf" type of ring made from an "exotic" would be best?
Aluminum is not a good choice for these and steel? "Problematical" I think. (At least for me)!
How about a solid, pure "Micro-grain carbide"? I use, "Cryo-treating"- to align the grain and even out the particle density throughout. And then apply "Titanium Nitride" coating them at a final thickness of "8-12" microns. That should work. They would be "gold" colored then of course. But I could make that a shiny OR a dull, "satin" gold color. OR, I could use another coating to fully encapsulate the ring as needed. For an aesthetically pleasing finish.
But then another person mentioned that it might be best to use a primary material having mechanical properties which should include, (A very low, "Volumetric to rigidity" ratio) and that would probably work best.
Unless you wish to get, "Really Exotic" as far as the materials go. You might want to try simply a magnesium "investment casting". I can then turn it to size. Then finish grind to spec, "Cylindrical and then flat grinding in that order to finish the ring to specified tolerances". This will prevent any possibility of any structural "lobing" issues in the parts future use. "Which is a secondary factor affecting the deformation of the transducing devices {wave launch/guide} area". Then again, if none of the tolerances are really that critical,
(+ < .00015", - < 0.00005", or better).
Then I could just, "Wire EDM" the entire thing in one shot!
For mine? I am not too worried about the amount of volume it takes up.
So, I think I am going to just go simple. I am just going to make a two-part form nearly to size with installed low pressure vacuum ports. And then hand lay-up some carbon fiber around a phenolic core. Add some .004", "Kevlar" fibers I have laying around at about (20%) of the mix to "toughen it up". And also add some very pure, "Stabilized Cu" in a powdered form which will help to keep continuity with the "Faraday" shielding/cage which I always like to do around the transduction array, "As a whole". With the shield components physically as well as "Magnetically coupled". /\ As far as the mechanical properties of materials will allow.
(Any "Faraday effect" is always better than NO "Faraday effect")!
And then I stabilize the "rings" entire system using a "System Three" structural, two-part epoxy. Which I can then "Post cure", by "Heat Treating" the rings. That specific mix that I use is, "Silvertip". Along with their fastest hardener! So it is tricky to use sometimes and also a bit expensive.
But, after all of that? It finishes out in the "Rockwell", "C" scale at (80-82).
Then finally I use a new type of Poly, with a "Molecular cross-linker" enhanced top-coat. Withg "). From the same company.
This stuff is "Ludicrously" tough....
Now say that last sentence really fast, three times in a row!

I don't want whatever he's on.

What is the problem?

You shouldn't let no-face keyboarders stop your grind. I for one would enjoy watching your project come to fruition.

Wow, thin skin and no sense of humor.

Yep that has to be our man.......line array omnidirectional speaker system carrot dangle. I can see the graphite fiber layed up rings being a cool experiment but no mention made of the need for threaded inserts and I can't see the need for a polyurethane finish with crosslinker additive for something that is going to be tucked away on the inside of a speaker. But having said all that post your project and show us some pictures.....should be fun.

I sure wouldn't mind having those. The flange could even be trimmed down as individuals needs for internal clearances dictated. Could easily be cut into 2 pieces for the passives heh heh. I know. That's some pretty huge cylindrical tubular stock and swing requirements for a lathe Cutting those on a CNC mill from plate would be wasteful of material but doable. Waste is mitigated somewhat by the fact that the MW rings could be cut from the interior before the passive rings. Perhaps the pieces that would be wasted from interior of MW rings could be used to make aluminum or non magnetic stainless tweeter bezels.

Oh, I noticed the, "Delrin" comment as well. Not a bad choice at all.
"It has crossed my mind once or twice".
But since I already have quite a large supply of another Dupont offering.
Which I believe has "possibly" even better properties for certain devices. But especially when those devices are meant for sound reproduction.
"Corian", and it comes in every color of the rainbow.
So in a way it's always, "Pre-finished". You're simply sanding, buffing and etc. to your preferred grade.
I could just make the entire baffle from a single piece. "Had plans to try that at some point anyway". And if I do not feel it is stiff enough alone. There is always the carbon fiber.
Did I already say that it is currently "free"?

xfactor wrote: »

At this point I just have to ask. "Since I really have no idea as to the exact needs of this particular application".
Are these, "rings" to be mounted from the, (inside) of an enclosure? With a transducers "cage" or "chassis", (outer ring) then sandwiched between this ring and the baffle?

YES. The rings allow the speaker to be tightly mated to the baffle without worrying about the screws damaging it.

xfactor wrote: »

Or? I am not familiar "evidently" with the exact speaker model you are dealing with. I currently own two different models of the "SDA" variety. One is the "SDA-2B" model which I have never had the chance to listen too.

You are missing out on some pretty good sounding speakers there. The rings referred to in this instance only make them better.

Hey, "F1Nut"?
Hee hee, "Yes" I understand that it is me. But whatever happened to "manners"?
I have noticed that you give excellent advice on speakers.
So, "Thank you". I do not think you hear that enough.
But in case anyone is thinking...Hee hee, a certain "something". You will find that I am truly, "Not a kiss a#!"!
I just believe in giving credit where it has been earned..(And also manners).
"At least I try".
Anyway, What size rings are needed in this application? "I.D. and also a (preferable) max. for the O.D."
Or is the O.D. of a specific dimension?
I am guessing here, but the thickness of said ring only matters as far as to how it, "may" affect the transducers, "wave launch" parameters? And all phasing, "time" as in, "BSC", should not be an issue?
Would that statement be correct?
Feel free to enlighten me!
By the way, I'll make some of these if anyone really wants them.
Like I said before. I was preparing to make some rings anyway. Maybe a little differently though.

Cut pieces of the "19.6 Oz." per yard, carbon fiber fabric are first glued to the interior. Overlapping about 2" at each seam when possible. This includes the entire inside of the enclosure and the int. "face" of the front baffle. Very difficult to complete and why you use the "rings".

Before the carbon fiber I did completely seal the cabinet. Using the structural two-part epoxy and adding some chopped fibers to the epoxy which was used for the top and bottom, "plates" of the enclosure. It was also "braced" with "Rock Maple", spars which I made from, (3/4" x 3-1/2") stock across and attached to the interior bracing already there. Those were the "weak points" as far as the enclosures large side radius was concerned.
Once sealed? "The interior pressures when the transducers are firing are way more than enough to actually (kill) you. If you were (somehow) inside the enclosure when they were being used as designed. "Well over the 5Psi needed" If only briefly.