and also............
There's a decent discussion
here on using WinISD.
It shows which parameters are important.
For example, in this quote from that very discussion.
Here is a response that Steven Kephart contributed in another thread, but it can by very useful as an addition to this one. This can help you understand relationships of parameters when you are filling in the driver editor for your subwoofer. You'll see statements like (paraphrased): "Fs is set by Mms and Cms." This gives you an indication that if your spec sheet shows all three of these parameters, use just the Mms and Cms and let WinISD calculate Fs from those values to avoid the possibility of getting an error. If your sheet shows only Fs, then that is what you input.
"Here's a quote from my old boss, Dan Wiggins, that helps explain Theile/Small parameters:
'There are only 6 fundamental physical parameters of a driver:
Re - the DC resistance of the voice coil (often called DCR). This includes the voice coil and tinsel leads. Measured in Ohms.
Le - the inductance of the voice coil. Usually measured in millihenries, sometimes microhenries.
Sd - surface area of the cone, usually measured in square centimeters.
Cms - compliance/stiffness of the suspension, usually measured in mm/N. That is, the suspension will sag X millimeters per Newton of force (there are ~4.5 Newtons per pound).
Mms - moving mass of the driver. Typically measured in grams.
BL - motor force factor of the driver. Measured in Tm (Tesla-meters) or N/A (Newtons per Ampere). I prefer the latter, because it is much more explicit about the force factor - X Newtons of force for every Amp of current you put through the driver (note that 1 Tm = 1 N/A).
and this:
I have gotten an indication from a reader that my wording in the 'Input the T/S parameters' section may lead you to think that you can fill in only a few parameters from your spec sheet and you're good to go. That is not true. You want the driver editor box to be filled out as completely as possible before you save it. Regarding what I wrote in the first paragraph here, you will see that the WinISD Help section on inputting parameters tells you to start with Cms and Mms (both physical parameters) if you have those values available. The reason they did not include Fs should be apparent to you now.
See why it's important to follow the method in the HELP file. Entering the best parameters to allow it to calculate the missing ones is quite important.........
brucek