I need to ask you guys a winISD question

[phantom240 5,000+ posts]

Hey, does anyone by chance have the complete working T/S parameters for the 15" Ascendant Audio Atlas? When I plug in the values that Ascendant sent me a long while ago, it comes back as conflicting crap... Can anyone help?

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[thehardknoxlife 10+ year member]

The suggested procedure for entering driver parameters is following (check first that "Auto calculate unknowns" option is checked):

1. Enter Mms and Cms

This gives fs. If either is not available, then enter fs and other parameter.

2. Enter Sd, Bl and Re

Now, you should get all but Qms (and Qts), Vas. Please note that Vas may not match exactly what is specified by manufacturer, because exact value of Vas depends on environmental parameters. See FAQ.

3. Enter Rms or Qms.

Either one will do, although I tend to prefer Qms over Rms, because it can usually be measured in driver measurement procedures.

4. Enter Hc, Hg and Pe.

If Hc or Hg or either is available, then enter Xmax and optionally either Hc or Hg if available.

5. Enter number of voicecoils.

This procedure is most accurate. Also note that it also calculates true SPL (1W/1m) value. So it might not match the marketing SPL value, which is generally somewhat vague. Not in all cases, though.

6. Correct Znom, if necessary.

If there are several voicecoils, then you must be careful when entering parameters in that case, because many manufacturers give Bl in voice coils in series, because it yields double value for Bl against parallel connection. If driver manufacturer gives Qes, Bl and Cms or Mms, then you can check how Bl is specified. For that, you can enter following parameters to calculate Re: Qes, Fs, Mms or Cms and Bl. Connection mode can be changed by changing the combobox selection. The driver editor then converts Bl and Re values accordingly.

Equivalently, you can check for Bl by entering:

Qes, Fs, Mms or Cms and Re (for desired connection mode).

If you enter resistance for parallel connection and get about half of advertised Bl, then you know, that Bl was specified that way.

 

[phantom240 5,000+ posts]

Yeah. I put in almost all the specs listed above, except for the more obscure specs... and it gave me a plethora of conflicting junk.

 

[Death By Bass 10+ year member]

Yeah. I put in almost all the specs listed above, except for the more obscure specs... and it gave me a plethora of conflicting junk.

of the qms, qts and qes, only enter two of the parameters, it will calculate the third.

then just enter the fs, vas, and re...

and thats enough to do a pretty good job of designing a box.

the x-max, and pe (rms power) will help too.

 

[thehardknoxlife 10+ year member]

Do it exactly like the tutorial I posted. Make sure the values are correct. For example : 25mm Xmax make sure it's in mm. You can change them simply by clicking on them. Xmax can be changed to mm,m,ft,in,cm and yd. Just make sure those are correct.