#46
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I have enough trouble searching this age old brain of mind for 'a' word never mind the right word. But you are right, a transducer takes one form of energy and converts it into another. I do not think of them as passive radiators either as passive radiators are usually thought of in the speaker context. Acoustic coupler perhaps.
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Fred |
#47
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But when you talk about using solid woods and you do not want them to crack, a table where the edges are not captured resulting in limited stresses building up due to moisture loss as compared to a guitar that binds the soundboard and back. My monitor and keyboard are on an oak desk that I built many years ago. It went through the same low humidity season as the guitar bodies I have built but have not been able to build necks for them. A number of the bodies have cracked over the winter, the desk has not. They may be both built out of wood and some of the same joints used in both are the same but the peculiarities of the guitar limit the mitigation that you can use in a piece of furniture. But then again, we do build plywood guitars.
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Fred |
#48
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If we're talking musical instruments, that's a good point. When we're talking about woodworking (particularly finishing wood), it's ludicrous. The reason you apply a finish to a guitar or a table is the same in each case. The type of finish and manner of application can of course differ - but that doesn't change the reason why you're applying it. The point of the breadboard end was also in the context of woodworking, not in the context of specific wood products or projects. The point was simply that you have to consider the effects humidity may cause when working with wood. How you deal with this varies, and is why I listed a range of situations. I have a hard time understanding why some folks can't comprehend this simple point. |
#49
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Proof is in your statement: Quote:
This doesn't need to be any kind of argument like you keep wanting it to be. It's really quite simple - You make a soda can very differently than you make an airplane, despite them both being made of aluminum. Same thing here. The OP asked why the underside of soundboards aren't finished and the answer is because the type of product, material and end use doesn't render it necessary. Other products that are made of wood may render it necessary. Plain and simple. |
#50
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You might be on to something here: deep-drawing of aircraft bodies.
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#51
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Et tu gr81dorn?
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#52
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-so we've got an idea of reflectance/absorption. -plate hardening data anyone? -tangible moisture barrier data seems like a wash... -opinions of "proper" crafsmanship seems like another wash... Last edited by arie; 06-08-2018 at 11:44 AM. |
#53
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arie asked:
"-plate hardening data anyone?" See "On the acoustical properties of violin varnish" by Martin Schleske, 'Journal' of the Catgut Acoustical Society, Vol. 3, #6, pp.27-43, November of '98. Along with the 'usual suspects' of violin varnish he covers nitrocellulose, and drying oils. I've already mentioned some of his results. |
#54
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Perhaps a more productive approach might be to list builders who do apply finish to the inside of their soundboards, and those who do not. Individuals can then determine if they prefer one cohort or the other, or have no discernable preference.
Trying to deconstruct the complex network effects and suggest how a finished top might influence the sound of YOUR build is quite a stretch. |
#55
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The funny thing about posting in forums, sometimes the topics branch off in other directions. I was answering points being made, made my own points. I do not find this at all too unusual.
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Fred |
#56
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although, i wouldn't want to use potassium silicate on my guitars |
#57
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how about a list of ambidextrous luthiers? my left hand might chisel in more tone than my right... |
#58
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"Wood is dead: it does not need to breath.
Wood is hydroscopic, meaning it absorbs and desorbs moisture in response to its environment. As it does so, it changes size - and geometry. There is almost nothing that can be done to prevent it from doing so. At best, one can slow down the absorption and desorption by applying a finish to its surfaces." Charles, That sounds very much like a description of the action of breathing. I do not think jschmitz5 was suggesting the wood is living, and actually breathing air. Rather that it takes in something, expands, and later releases that something, and shrinks. Like your lungs. Ed
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"Quote The Raven, NEVERMORE !" |
#59
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#60
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But no, you're right to enjoy the currently focused state of this discussion, your hilarious argument included. |