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In Reply to: RE: total speculation. nt posted by Davey on August 26, 2010 at 06:41:10:
Data needed? hmmmmm
This would be cost-no-object, wishful thinking type data.
accelerometer data. several frequencies from say.....35hz to 400hz....something in that range.
Single frequencies used, to find resonant modes. Crossover? Leave that out of it at first. Check for differences between pole piece front and back. Do frequency response sweeps and impulse tests across 30 or 40 degrees in front of the panel.
Do such tests for stock panels.....and at several levels of mod and for different designs of the same or similar mod. Nobody has the time, money or resources to do this! Obviously.
On the practical side, I don't know what the minimum would be to tell differences between different panels and mods. I suggested the MASS (weight, sorta) of panels effects the resonance and vibration properties. This was not received well. But it is just what people 'think', not what they know. I don't know, either, but seems reasonable. When someone added that metal to the back, what effect did he really have? More stiffness? Sure weighed a lot more. Need to try to separate out these various thoughts.
Look at this from someone just walking in viewpoint. There are 3 or 4, maybe more, theories and courses of action to help panels perform better. All agree that vibration is key. Some talk about absorbing vibration, others coupling to ground. Others use sandwich construction while others dampen. Some clamp while others say, not to! Metal stands? Stiffening? Real Wood? Dynamat? BlueTac? Balsa Wood? This list goes on. Some theorists seem to have trouble telling the difference between the different effects. I can understand this problem.....Looking at the whole thing, it is pretty complex.
My personal model is single sided, lightweight wood. I want it to have the highest resonant frequency possible consistent with high stiffness. No metal in the load bearing part of any stand. I have other features in mind, as well, which I have not seen discussed and are known in the 'rest' of the speaker world, so are not revolutionary. NO damping material will be applied at first, if ever, and the pole pieces will face the listener. Crossover will remain stock, but be located to an external box. Crossover helps will come down the pipe at a later date. The driver will be in very firm contact with the wood but have no holes drilled.
All the theories simply can't be right. Some even conflict with one another...which is what sets me off. A proper theory can be used to PREDICT. So if you theorize 'X', than 'Y' and 'Z' should also occur. If you don't observe what you predict based on your theory, you need to think it thru again. i don't have funds, time or facilities to do what I intend more than once. I'm taking a woodworking class right now up at the JC and hope to start on my frames next year at this time.
Too much is never enough
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Follow Ups
- RE: total speculation. nt - pictureguy 09:31:28 08/26/10 (0)
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