Originally Posted by tjcinnamon
I have the worst luck entering in SI drivers. What order did you enter them in.
I tried: Qes, Qms,Vas, Fs, Re,Le,Sd, Xmax, Pe.
Then tried: QMS, MMS, CMS, RE, BL, LE, SD, XMAX, PE
Each time the other non-calculated parameters were way out of whack.
There is a help page link in the software that explains the order to enter the parameters:
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.
There seems to be a problem with Fs and CMS. When Fs is 21 as per spec, I am seeing a calculated value for CMS of 138.1. Everything else seems to match up. Be sure the units in Winisd are correct, which can be a problem when manufacturers don't specify, but if you get weird results, it is likely a units discrepancy. Just click on the unit description to change it.