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[null,"A)  Excursion limited rms sound pressure level (SPL) for a driver in a closed box (monopole)"]
[null,"and in an open baffle (dipole) at 1 m distance on-axis, in free-space"]
[]
[null,"Enter bold faced values for the driver under investigation, path difference and start frequency:"]
[null,"Add 6 dB to SPL for radiation into half-space."]
[]
[{"$nulls":4},"1252DVC","21W/8554"]
[{"$nulls":4},"Driver A","Driver B"]
[{"$nulls":3},"Effective piston area Sd =",530,200,"cm^2"]
[{"$nulls":3},"Peak excursion Xmax =",6,6.5,"mm"]
[{"$nulls":3},"Effective path difference D =",483,248,"mm"]
[]
[{"$nulls":3},"Effective piston diameter d =",{"v":259.77239243415306,"d":"260"},{"v":159.57691216057307,"d":"160"},"mm"]
[{"$nulls":3},"Volume displacement Vp =",318,130,"cm^3"]
[]
[{"$nulls":3},"SPL dipole=monopole at Fequal =",{"v":120.72463768115942,"d":"121"},{"v":235.1209677419355,"d":"235"},"Hz"]
[{"$nulls":3},"SPL (at Fequal) =",{"v":115.73918111242614,"d":"116"},{"v":119.54932375588605,"d":"120"},"dB"]
[]
[{"$nulls":3},"Monopole SPL at 100 Hz =",{"v":112.46734468564485,"d":"112"},{"v":104.69766933209293,"d":"105"},"dB"]
[{"$nulls":3},"Dipole SPL at 100 Hz =",{"v":110.83142647225421,"d":"111"},{"v":97.27184212019637,"d":"97"},"dB"]
[]
[]
[null,"Frequency","mono A","dipole A","mono B","dipole B"]
[null,"Hz","dB SPL","dB SPL","dB SPL","dB SPL"]
[null,25,{"v":88.38494503252635,"d":"88"},{"v":74.70782699257646,"d":"75"},{"v":80.61526967897443,"d":"81"},{"v":61.14824264051862,"d":"61"}]
[null,{"v":35.35533905932738,"d":"35"},{"v":94.40554494580596,"d":"94"},{"v":83.73872686249588,"d":"84"},{"v":86.63586959225405,"d":"87"},{"v":70.17914251043806,"d":"70"}]
[null,{"v":50.00000000000001,"d":"50"},{"v":100.42614485908561,"d":"100"},{"v":92.76962673241535,"d":"93"},{"v":92.65646950553368,"d":"93"},{"v":79.21004238035749,"d":"79"}]
[null,{"v":70.71067811865477,"d":"71"},{"v":106.44674477236524,"d":"106"},{"v":101.80052660233478,"d":"102"},{"v":98.6770694188133,"d":"99"},{"v":88.24094225027693,"d":"88"}]
[null,{"v":100.00000000000003,"d":"100"},{"v":112.46734468564483,"d":"112"},{"v":110.8314264722542,"d":"111"},{"v":104.69766933209293,"d":"105"},{"v":97.27184212019637,"d":"97"}]
[null,{"v":141.42135623730957,"d":"141"},{"v":118.48794459892446,"d":"118"},{"v":119.86232634217363,"d":"120"},{"v":110.71826924537255,"d":"111"},{"v":106.3027419901158,"d":"106"}]
[null,{"v":200.0000000000001,"d":"200"},{"v":124.50854451220408,"d":"125"},{"v":128.89322621209305,"d":"129"},{"v":116.73886915865218,"d":"117"},{"v":115.33364186003524,"d":"115"}]
[null,{"v":282.8427124746192,"d":"283"},{"v":130.5291444254837,"d":"131"},{"v":137.9241260820125,"d":"138"},{"v":122.7594690719318,"d":"123"},{"v":124.36454172995468,"d":"124"}]
[null,{"v":400.0000000000003,"d":"400"},{"v":136.54974433876333,"d":"137"},{"v":142.54974433876333,"d":"143"},{"v":128.78006898521141,"d":"129"},{"v":133.39544159987412,"d":"133"}]
[{"$nulls":3}," "]
[]
[]
[null,"B)  Required volume displacement to obtain a specified SPL at 1m in free-space"]
[null,"(Note that 109 dB SPL requires 1 Watt acoustic radiation)"]
[]
[null,"Enter bold faced values for SPL, dipole path difference and start frequency. "]
[null,"Divide calculated Vp by two for radiation into half-space."]
[]
[{"$nulls":3},"SPL =",90,"dB"]
[{"$nulls":3},"Effective path difference D =",483,"mm",null,"Fequal =",{"v":120.72463768115942,"d":"121"},"Hz"]
[]
[{"$nulls":3},"Vp = Sd Xmax"]
[null,null,"Frequency","monopole","dipole"]
[null,null,"Hz","cm^3","cm^3"]
[null,null,25,{"v":383.8132670431181,"d":"384"},{"v":1853.428704040101,"d":"1853"}]
[null,null,{"v":35.35533905932738,"d":"35"},{"v":191.90663352155926,"d":"192"},{"v":655.2860025362756,"d":"655"}]
[null,null,{"v":50.00000000000001,"d":"50"},{"v":95.95331676077927,"d":"96"},{"v":231.67858800501196,"d":"232"}]
[null,null,{"v":70.71067811865477,"d":"71"},{"v":47.97665838038962,"d":"48"},{"v":81.91075031703411,"d":"82"}]
[null,null,{"v":100.00000000000003,"d":"100"},{"v":23.988329190194857,"d":"24"},{"v":28.959823500626534,"d":"29"}]
[null,null,{"v":141.42135623730957,"d":"141"},{"v":11.994164595097427,"d":"12"},{"v":10.238843789629279,"d":"10"}]
[null,null,{"v":200.0000000000001,"d":"200"},{"v":5.9970822975487135,"d":"6"},{"v":3.6199779375783154,"d":"4"}]
[null,null,{"v":282.8427124746192,"d":"283"},{"v":2.998541148774356,"d":"3.0"},{"v":1.2798554737036594,"d":"1.3"}]
[null,null,{"v":400.0000000000003,"d":"400"},{"v":1.499270574387178,"d":"1.5"},{"v":0.749635287193589,"d":"0.7"}]
[null,null,{"v":565.6854249492385,"d":"566"},{"v":0.7496352871935889,"d":"0.7"},{"v":0.3748176435967944,"d":"0.4"}]
[null,null,{"v":800.0000000000007,"d":"800"},{"v":0.3748176435967944,"d":"0.4"},{"v":0.1874088217983972,"d":"0.2"}]
[null,null,{"v":1131.370849898477,"d":"1131"},{"v":0.18740882179839718,"d":"0.2"},{"v":0.09370441089919859,"d":"0.1"}]
[null,null,{"v":1600.0000000000014,"d":"1600"},{"v":0.09370441089919859,"d":"0.1"},{"v":0.046852205449599296,"d":"0.0"}]
[null,null,{"v":2262.741699796954,"d":"2263"},{"v":0.046852205449599206,"d":"0.0"},{"v":0.023426102724799603,"d":"0.0"}]
[null,null,{"v":3200.0000000000027,"d":"3200"},{"v":0.023426102724799645,"d":"0.0"},{"v":0.011713051362399822,"d":"0.0"}]
[null,null,{"v":4525.483399593908,"d":"4525"},{"v":0.0117130513623998,"d":"0.0"},{"v":0.0058565256811999,"d":"0.0"}]
[]
[]
[]
[null,"Formulas used for monopole:"]
[null,"SPL = 100.3 + 20 log(Xmax) + 40 log(f) + 40 log(d) - 20 log(r) ",{"$nulls":5},"Units are dB, m, Hz"]
[null,"SPL = 102.4 + 20 log(Vp) + 40 log(f) - 20 log(r) "]
[]
[null,"Formulas used for dipole:"]
[null,"SPLdipole = SPL - 20 log(Fequal / f)  if f < 3 Fequal, else SPLdipole = SPL + 6"]
[null,"Vdipole = Vp (Fequal / f)  if f < 3 Fequal, else Vdipole = Vp / 2"]
[]
[null,"LINKWITZ LAB - 19 February 2001"]