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 20th April 2008, 09:43 AM #1 schmeet   diyAudio Member     Join Date: Mar 2008 Driver Velocity Hi guys, If i have the driver velocity Ud. how can i work out the pressure level from that? I'm guessing its gotta be something like Ud * Sd * p * c where Ud = Driver Velocity Sd = Cone Area p = Density of air c = Speed of sound I'm not quite sure though, does anyone have any ideas? Thanks Pete P.s. I'm calculating Ud (in an infinite baffle) using: Ud = Pg / ((1 / jwCas) + jwMas + Rat) Where: Pg = Acoustic Driving Pressure = (eg Bl) / (ReSd) Cas = Acoustic Compliance = Vas / (pc^2) Mas = Acoustic Mass (not too sure how to calculate this?) Maybe (1 / (fs^2 * Cas)) Rad = (Bl^2 / Sd^2) * (Qes / (Re * Qms)) Rat = Total Acoustic Resistance = Rad + (Bl^2 / (Sd^2 (Re + jwLvc))) __________________ leonardaudio.co.ukTransmission Line Modelling Software
 20th April 2008, 04:14 PM #2 bjorno   diyAudio Member   Join Date: Mar 2005 Location: Jacobsmountain Hi Pete, Maybe this paper can give you a hint: http://courses.ece.uiuc.edu/ece403/l...c11.070209.pdf b

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