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leslie
- 论坛博士后
- 19720110
- 27155
- 28495
- 2003-01-24
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t
T
发表于 2011-04-26 13:04
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轉載自 www.soundsolutionsaudio.com
這位"殺很大"的法籍先生正是darTZeel售出的全球首位用家.
他一輩子投入高效率號角.別人視為瘋狂的行徑對他而言.剛好而已!
他不是別人.更不是手拿遙控器看著電視渡過一生的一般人 .
他所代表意義在於:熱誠 與 實踐者
下列圖片是這位先生建構他那巨大古典號角喇叭的超低音號角一覽.絕無僅有.
不管您看了感想如何.可曾想過教堂裡那巨大管風琴的低頻如何發聲?
有興趣的朋友請以科學觀點研究不經任何壓縮方式發聲的低音號角計算原理.資料截至下列網站:
感謝球形號角資料來源提供:Hi-AV影音部落 總編:廖斐森
The hyperbolic / exponential formulaArea = Throat Area [ cosh ( x*2*Pi*f / c) + M * sinh ( x*2*Pi*f / c) ] ^2
where
- x = distance from throat
- f = the cutoff frequency of the horn
- M = the flare constant - M = 1 is exponential, 0 < M < 1 is hyperbolic
- c = the speed of sound, approximately 13538 inches per second or 344 m/s (depends on temperature, etc.)
Mouth SizeFor a horn radiating into full space, the horn mouth should have a circumference equal to the wavelength of the low cutoff frequency. Usually, what is of interest is the area of the mouth since bass horns are not commonly made with circular mouths. Here’s how you get to an equation for the mouth area:- Circumference = c / f
- and Circumference = Pi * diameter = Pi * 2 * radius
- setting these equations equal, Pi * 2 * radius = c / f
- radius = c / (2 * Pi * f )
- In addition, Area of a circle = Pi * radius^2
- Substituting in for radius, Area = Pi * [c / (2 * Pi * f )]^2
If you want to find the appropriate mouth area for a loading situation other than full space, you would divide this area by the appropriate factor (divide by 2 for half space, by 4 for 1/4 space, etc.).
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