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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#41
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speaker phasing
"William Sommer******" Here's the answer to your question about Boyle's Law (which you will ignore, of course)... PV = k assumes a constant temperature. ** PV= k shows that it does not matter what the gas is - the same volume changes produce the same pressure changes. Uh... No it doesn't. ** Yes it does. k is temperature-dependent. ** Irrelevant when there are simply no temperature changes going on. So the stiffness of an enclosed volume of gas is the same for all gasses. The resonance frequency of a woofer will be unaffected by it. That's not what we're talking about, ** Yes it is. You bull****ting, tenth wit asshole. ..... Phil |
#42
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speaker phasing
"Phil Allison" wrote in message ...
k is temperature-dependent. ** Irrelevant when there are simply no temperature changes going on. They can occur when you compress (or rarefy) the gas. What do you think the terms "adiabatic" and "isothermal" refer to? |
#43
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speaker phasing
"William Sommer******"
Here's the answer to your question about Boyle's Law (which you will ignore, of course)... PV = k assumes a constant temperature. ** PV= k shows that it does not matter what the gas is - the same volume changes produce the same pressure changes. Uh... No it doesn't. ** Yes it does. k is temperature-dependent. ** Irrelevant when there are simply no temperature changes going on. So the stiffness of an enclosed volume of gas is the same for all gasses. The resonance frequency of a woofer will be unaffected by it. That's not what we're talking about, ** Yes it is. You bull****ting, tenth wit asshole. You simply have no case - so **** off. ..... Phil |
#44
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speaker phasing
Consider the following statements:
"For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional." Right? Now this one... "Boyle's law is used to predict the result of introducing a change, in volume and pressure only, to the initial state of a fixed quantity of gas. The before and after volumes and pressures of the fixed amount of gas, where the before and after temperatures are the same (heating or cooling will be required to meet this condition), are related by the equation P1V1 = P2V2." See the disclaimer? Compressing/expanding a non-ideal gas heats/cools it. Assuming that both air and SF6 are non-ideal, this produces a non-linear restoring force. SF6 is supposedly closer to ideal, so it should provide lower distortion in a "true" acoustic-suspension system, where the gas provides a big percentage of the restoring force. You'd better give up, because I'm going to keep posting this until you do. |
#45
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speaker phasing
"William Sommer******" Here's the answer to your question about Boyle's Law (which you will ignore, of course)... PV = k assumes a constant temperature. ** PV= k shows that it does not matter what the gas is - the same volume changes produce the same pressure changes. Uh... No it doesn't. ** Yes it does. k is temperature-dependent. ** Irrelevant when there are simply no temperature changes going on. So the stiffness of an enclosed volume of gas is the same for all gasses. The resonance frequency of a woofer will be unaffected by it. That's not what we're talking about, ** Yes it is. You bull****ting, tenth wit asshole. You simply have no case - so **** off. ..... Phil |
#46
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speaker phasing
On 12/09/2013 06:02 PM, Phil Allison wrote:
"William Sommer******" Here's the answer to your question about Boyle's Law (which you will ignore, of course)... PV = k assumes a constant temperature. ** PV= k shows that it does not matter what the gas is - the same volume changes produce the same pressure changes. Uh... No it doesn't. ** Yes it does. k is temperature-dependent. ** Irrelevant when there are simply no temperature changes going on. So the stiffness of an enclosed volume of gas is the same for all gasses. The resonance frequency of a woofer will be unaffected by it. You're quite right that the compressibility of the gas *at constant temperature* is very nearly independent of the composition, by the ideal gas law. However, acoustic waves aren't isothermal, they're nearly adiabatic (i.e. heat doesn't have time enough to diffuse very far in one acoustic cycle). In an adiabatic process, the compressibility depends fairly strongly on the number of degrees of freedom of the gas molecule. There's a quite reasonable discussion at http://en.wikipedia.org/wiki/Adiabatic_process#Ideal_gas_.28reversible_process. 29 SF6 has lots and lots of degrees of freedom. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net |
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