Scan-Speak FRD ZMA request

[Allan]

Would anyone be able to direct me to Scan-Speak ZMA & FRD file for the following drivers, for a prelim design before I buy...

21W8555-01
18W8545-00

Cheers

[kelticwizard]

I have no experience using them, but I am given to understand that you can make your own FRD and ZMA files from the Scan Speak charts and tools on the FRD Consortium page.

[kelticwizard]

By the way, he mentioned SPL Tracer/Viewer as a way to do this. Looking quickly at the SPL Tracer website, it appears you can make an FRD file by this method. However, I don't know if you can make a ZMA file, though at first glance it seems as if the process would be similar.

SPL Tracer/Viewer is on the FRD Consortium website.

[Allan]

I already have the SPL & IMP tracer programs, they are excellent! They work very well, but I cant find any charts from which I can trace the phase response, this is my only hickup at the moment.

Al.

[kelticwizard]

You should be able to use Subwoofer Simulator, written by our own member here, F4ier, for that. It calculates the impedance phase from the Thiele-Small parameters.

It is listed both on F4ier's own website, and on the FRD Consortium page.
http://www.geocities.com/f4ier/speaker.htm

A lot of people like Unibox, but I never seem to be able to get anything out of it. Subwoofer simulaor, in this incarnation, might not allow you to model multiple woofers, but it gives you just about any curve you could possibly want-impedance pahse, cone excursion, passive radiator excursion, etc. etc. And you can add or subtract them to your chart so it doesn't get too confusing. And you can change the scale. And you can even change the colors to make it look snazzy.

Below is the impedance phase of a Scan Speak 21W8555-00 woofer from 10 Hz to 2,000 Hz-about as high as you would ever want to use it, I guess.

Since Subwoofer Simulator does not do free air, I put the Scan Speak inside a sealed box of 2.000 liters. It essentially is in a free air situation. You can alos simulate the curve for whatever specific box you put it in: sealed, ported or passive radiator.

Oh, yes, if you do this yourself, you can just click File and it writes FRD and ZMA files itself.

[kelticwizard]

And here is the Scan Speak 18W8545-00 from 10 Hz to 10,000 Hz.

Again, same deal-just click File and write your own FRD or ZMA file if you want.

Let us know how this works out.