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[werejaguar]

hello, I'm looking for some information about the port saturation phenomenon. I've been googling on web and didn't find useful information, or some legible technical paper. Does anyone know a good book or source of info for study this?. I'm reading Beranek's Acoustics, but he didn't wrote about port saturation. I'm just trying to design a correct vented box. Did many calculations with encshop and seen the port excursion curves but I don't understand exactly how works this problem about port saturation.

Excuse me if I bother too much. Thanks a lot!!! :)

any news about the new LMS?? :D

[cstrahm]

>> I'm looking for some information about the port saturation phenomenon.
>> I 've been googling on web and didn't find useful information,
>> or some legible technical paper.
>> Does anyone know a good book or source of info for study this?.
>> I'm reading Beranek's Acoustics, but he didn't wrote about port saturation.

You will not find much in the old literature about port nonlinearity. Nonlinear effects require numerical solutions and that requires computers. 50 years ago the computation levels were so low all they could do was create modeling for just the most simple first order linear transfer function approximations. Harry Olson did more of this nonlinear studies than probably anyone back in the days of RCA, but it was mostly all measurements. The math becomes very difficult and cumbersome quickly. Even today just writing the nonlinear equations for a MOSFET transistor is almost beyond human capabilities without computer based symbolic solvers like Maple. Nearly all of the nonlinear models I created in LEAP are emperical and were based on thousands of actual measurements. The systems are generally too complex for analytic expressions, and then there is the problem of having data to put into them. For example, where do you get the Young's modulus for a particular surround or spider.

>> but I don't understand exactly how works this problem about port saturation.

Not sure what your question is. As the velocity of air in the port increases, so does the resistance. That is the nonlinear effect. Port saturation is a general term used where the resistance in the port has become so large that the effectiveness of the port is all but destroyed.

[werejaguar]

many many many thanks chris!! :)

Beranek's Acoustics is certainly a very old book, and as you said it has restrictions of there years, but i think it's still current, and good for beggineers like me :D . I saw there is a suggested bibliography at the end of encshop manual, i'll consider read some of these too, surely they are very good books.

thanks again!