WinISD or Madisound problem

[icor1031]

WinISD Beta and Alpha do the same thing.
What's the deal, why is my F3 @ 70Hz, when the site says a 1.5 ft3 box will get me 47Hz F3?

Thanks.

[Whitneyville1]

Re: WinISD or Madisound problem

I think Madisound transposed 47 Hz for 74 Hz. That's the only thing that makes sense and what I got with WinISD (the newest version). I ran it three times, Beta, Alpha, and ISD to be certain. In 1.75 cu.ft ported I got a flat response (+.3dB). It would take a much larger sealed enclosure to be "ideal" by WinAlpha or ISD.

[icor1031]

Re: WinISD or Madisound problem

In that case, the Nomex does 19Hz better.

Thanks.

[peepaj]

Re: WinISD or Madisound problem

icor fs looks to be 42Hz, it's right under Le on the spec page.

[MSaturn]

Re: WinISD or Madisound problem

use something other than winISD and see what happens.

[AR3A]

Re: WinISD or Madisound problem

Is there a solid version of WinISD ? I get a littler unsettled when I hear the words alpha and beta. I use the beta all the time, I have never used the alpha.

[HareBrained]

Re: WinISD or Madisound problem

As peepaj stated, the modeled FS is wrong. Change your 64 to 42.

I use Unibox myself, and love it.

[Chris Roemer]

Re: WinISD or Madisound problem

Is there a solid version of WinISD ? I get a littler unsettled when I hear the words alpha and beta. I use the beta all the time, I have never used the alpha.

"beta" gives results VERY SIMILAR to "Alpha" (a.k.a. "Pro") and to every other reputable box modeler out there.

Beta has a couple features Pro doesn't have. And Pro can be a bit finicky with data entry until you get the hang of it. But Pro takes you ten times deeper into your explorations than beta can.

You'll finally understand what's meant by "excursion limited".
You can model passive radiators.
You can dial in different amounts of "leakage" for your box.
You can simulate a plate amp's low pass filter on a sub.
And much, much more.

Chris

[fastbike1]

Re: WinISD or Madisound problem

Do you have Excel?

http://audio.claub.net/software/jbabgy/WBCD.html

or

http://audio.claub.net/software/kougaard/ubmodel.html

Is there a solid version of WinISD ? I get a littler unsettled when I hear the words alpha and beta. I use the beta all the time, I have never used the alpha.

[mdocod]

Re: WinISD or Madisound problem

Things to consider:

WinISD Alpha Pro works fine, and is a reasonably accurate simulator provided you know it's qwerks and how to work around them. The most important thing is getting the driver data correctly entered. I like to let WinISD calculate most of the T/S specs from mechanical specs when entering driver information. There is an order that works well and prevents "problems." If you let WinISD do the calculations for you, and you see a discrepancy in it's results that are greater than say +/-10% from published specs, then you know there may be a misprint. At that point, it's a matter of experience deciding where the error most likely is, and either trusting your gut, or moving on to a different driver that doesn't have discrepancies.

I don't recommend the beta version because without the ability to simulate Xmax vs Pe, amateur builders are apt to be lead astray simply looking for the most extreme "flat extension" without being shown the sacrifices in dynamic range that are given to achieve those response curves. Flat to 20hz doesn't do you any good if the system is Xmax limited to 90dB and you wanted a 110dB capable pair of speakers. Simulation looking for "deep flat extension" only will often lead to the use of high distortion drivers.

If you want more accurate simulations, use Hornresp. Hornresp uses much more "industrial strength" math far beyond my comprehension, to produce a simulation result.

Regards,
Eric

[icor1031]

Re: WinISD or Madisound problem

Oh, I used F instead of Fs. :rolleyes:

Thanks.

[Whitneyville1]

Re: WinISD or Madisound problem

Duh'o! I just plugged your numbers in 3 times and ran them...a Homer Simpson moment!

[AR3A]

Re: WinISD or Madisound problem

WinISD pro keeps telling me that there is a consistency check fail on Qts, Qms, Qes.

For this driver

http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=264-1078&scqty=2

[AR3A]

Re: WinISD or Madisound problem

I got it, don't enter Qts the program uses the other two to calculate Qts.

[peepaj]

Re: WinISD or Madisound problem

Check out this thread, post 13 has zaph's measurements. You could try using them.

http://techtalk.parts-express.com/showthread.php?t=230802