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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo Frame modification.
Post Subject: Some further thoughtsPosted by jessie.dazzle on: 12/25/2006
Yeah, the scale of things looks more like what I would expect... In my images I used the models of horns I am building for myself... so the Fundamantals horn is not the same as yours... also, it is placed too close to the listener, but was just trying to get a stand mocked up.
Regarding your latest version : Yes your plate will have to be quite thick if it is not going to sway or twist... you can of course do it, but you will need to start with a very flat plate (not always the case with plate), and may want to consider securing it with a larger diameter and longer (higher) cylinders, cross bolting them through the plate.
My intuition : Considering a 1/2 inch plate, the 8 vertical feet, and the load (with which I have become very familiar)... I feel you would be better off with a section offering more inhernet natural resistance both lateraly and torsionaly. Extending the cylinders a lot further up the plate would be one way to achieve some of this.
Here's another idea : You could use the plate as in your latest images, but sandwitch it between two smaller, thinner plates of similar shape, spaced out an inch or two from the central plate. These side plates would not go up as high (maybe only 6 feet). They could be bolted to the main plate using long bolts and cylindrical spacers that hold them out from the central plate. Large diameter spacers and properly torqued bolts would give you plenty of additional resistance in bending and torsion, while offering a more secure mounting point at the base. You would preserve the nature of your design, and the whole thing could be unbloted.
A nice progressive increase in resistance could be acheived via use of longer spacers near the base, and shorter spacers toward the top, giving you a curve when veiwed from the front (once the side plates have been sucked in by the tension of the bolts). You'd of course have to first suck in the side plates with big clams before marking the bolt holes.
I can help if you'd like to see any of your ideas in more finished computer renderings.
Regards,
jd*Rerurn to Romy the Cat's Site