Brainstorming about this stuff I’ve thought about a down firing woofer in an upright egg with a midrange and tweeter facing the listener.
There’s some cool higher end stuff that might be more for the car audio world. Audible Physics has a small point source coax as well as cdt. Hybrid Audio Technology might also have one. I still occasionally check ebay and diymobile audio for used fountek fr59exe’s. I regret not grabbing a pair or two of these when still in production.
If the angle between the baffle and the start of the egg is 45 degrees or less, you will get a benefit. 30 degrees is better.
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@Lawnboy : I 3D printed my "egg" speaker and used it eventually in a 3 way configuration with a 2 x woofer module. I used a Sica 5inch coaxial driver for this project. All my experience with it including polar measurements and crossover design can be found here.. 🙂
https://www.diyaudio.com/community/threads/a-3-way-design-study.376620/post-7097856
There is even a comparison between it and the KEF reference 1 meta coaxial speaker later in the thread 😉
Regards
Vineeth
https://www.diyaudio.com/community/threads/a-3-way-design-study.376620/post-7097856
There is even a comparison between it and the KEF reference 1 meta coaxial speaker later in the thread 😉
Regards
Vineeth
Well, the outside surface and its geometry is important.
Aside from the usual errors I find, like nominating standing waves where they can't form - inside a little box- so trying to defend the error and calling it internal resonances. Well, everything resonates !
So external shape is important as it reflects the incoming waves...yes, boundaries reflect them, and an enclosure surface is a boundary for a wave
Aside from the usual errors I find, like nominating standing waves where they can't form - inside a little box- so trying to defend the error and calling it internal resonances. Well, everything resonates !
So external shape is important as it reflects the incoming waves...yes, boundaries reflect them, and an enclosure surface is a boundary for a wave
I am not sure if that was in response to me or not. If so, my point was only that the outside shape is relatively simple to visualize and construct once you decide the bevel, sphere, ogive, etc, as opposed to the inside where placing and supporting ports, volumes, damping materials, etc. doesn't seem to have the level of established rules of thumb to guide someone. Especially given the discussion on fiberglass/resin type construction using a dissolving egg (which makes me visualize an empty shell like the old beerball).
I don't have enough experience or knowledge to discuss wave formation or resonance issues, I am sorry if I have inadvertently struck a point of contention for you.
I don't have enough experience or knowledge to discuss wave formation or resonance issues, I am sorry if I have inadvertently struck a point of contention for you.
Indeed I was refering to the shape.
Which has to reflect waves as well as emitting them. We are talking about sound.
Inside there's not sound, just chaotical pressure, if you put boundaries- a box.
And inside a box standing waves, again, for the reason of the wavelenghts interested in the phenomenon and the timing of the superposition, can't happen.
Sorry for the rant
Which has to reflect waves as well as emitting them. We are talking about sound.
Inside there's not sound, just chaotical pressure, if you put boundaries- a box.
And inside a box standing waves, again, for the reason of the wavelenghts interested in the phenomenon and the timing of the superposition, can't happen.
Sorry for the rant
I heard them often. Very nice indeed for a speaker of that size. It was a good kit, I almost bought one and can’t remember now why I didn’t.
Of course the egg shaped enclosure was not new in France at time. There had long been a brand of French speakers in round, egg and bunny ear shapes. Used to se them in control rooms. They were white and made of plaster. Or more precisely “Staff”. A mixture of plaster and fiber. Heavy and acoustically dead.
If I remember correctly, there were at least two versions of the Onken-Focal kit with the "Egg". The first was with the Focal 10C01 woofer I think, and the mid had a phase-plug. I guy in my class when studied electronics had a different version. It was using a Focal 10C02 woofer, and the mid did not have a phase plug. I think it was a 7" called 7MC2. The tweeter was that yellow glass-fiber inverted dome that Focal was known for.
The speaker sounded dynamic and clean, but I never liked the tonal balance in it. Too shy in the mid-bass, and rather dull at the top end.
The speaker sounded dynamic and clean, but I never liked the tonal balance in it. Too shy in the mid-bass, and rather dull at the top end.
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It didn’t have a lot of bass weight, true.
But i was comparing it to much larger Onken rigs, so not a fair fight. I remember quite liking the midrange and stereo image. Dull at the top probably wouldn’t have bothered me as I hate most tweeters. 😉
But i was comparing it to much larger Onken rigs, so not a fair fight. I remember quite liking the midrange and stereo image. Dull at the top probably wouldn’t have bothered me as I hate most tweeters. 😉
FWIW: Elipson was the name of the French speaker in egg shapes. And there was the notorious rabbit ear that looked more like a fancy urinal.
Here is a nice article on the company
https://www.inner-magazines.com/audiophilia/elipson-a-loudspeaker-that-made-new-music/
I never owned any, but did work with some of the people mentioned at the GRM. They loved speakers, the more the merrier. Fun times.
Here is a nice article on the company
https://www.inner-magazines.com/audiophilia/elipson-a-loudspeaker-that-made-new-music/
I never owned any, but did work with some of the people mentioned at the GRM. They loved speakers, the more the merrier. Fun times.
Just fishing for feedback on where my thoughts have concentrated over the weekend. I’ve found a 14” tall, 8.5” diameter egg on amazon for $15 that could be the mould for the enclosure. I imagine cutting the egg at it’s widest diameter point and laying the glass inside the eggs hemispheres to greatly reduce finishing compared to laying the glass on the outside and having a ton of sanding ect. It would also allow me to lay it thicker per application for deader walls without complex bracing in the odd shape. I’ve noticed that resin doesn’t stick to all plastics, particularly the type used in the mixing cups from Home Depot. I might, or might not need something to prevent adhesion to the egg walls. That silly bunny impression can be in the back and maybe be where the binding posts are.
The final internal volume would be about .2cf and the Anarchy 554 (sealed) would be down firing while the Scan Speak 10f, in a tiny separate enclosure, would be firing on axis. That’s it, upright egg enclosure, 5.5” woofers, and what I’ve seen to be about the best fullrangers on the market without getting too far past the point of diminishing returns on price vs performance.
I have no realistic choice for the bookshelf speakers location except on the shelves and in the corners. The hoping is that the tightening polar response starting around 1khz, where wavelength gets around a foot in length, will help with the wall’s being so close.
https://erinsaudiocorner.com/driveunits/scanspeak_discovery_10f8414g10_fullrange/
Just posting the living room again for a visual reference on using the 10F’s to control reflections.
The final internal volume would be about .2cf and the Anarchy 554 (sealed) would be down firing while the Scan Speak 10f, in a tiny separate enclosure, would be firing on axis. That’s it, upright egg enclosure, 5.5” woofers, and what I’ve seen to be about the best fullrangers on the market without getting too far past the point of diminishing returns on price vs performance.
I have no realistic choice for the bookshelf speakers location except on the shelves and in the corners. The hoping is that the tightening polar response starting around 1khz, where wavelength gets around a foot in length, will help with the wall’s being so close.
https://erinsaudiocorner.com/driveunits/scanspeak_discovery_10f8414g10_fullrange/
Just posting the living room again for a visual reference on using the 10F’s to control reflections.
Thoughts on the down firing woofer and scan 10f two way? Both on the 10f choice and the reason involving placement and corner/wall proximity.