June 24, 2010
WinISD - entering new driver data
Entering new driver data is a little tricky in WinISD pro. As the numbers are calculated, if you simply enter in all the parameters as shown in the data sheet, it won't work. A simple thing like rounding off the numbers will mess it up. You can find detailed instructions in the help files, but my video tutorial will give you the gist quickly.
A few tips:
1. Enter in the parameters in the exact order shown
2. If one parameter is missing, let the program calculate it from the others
3. Let the program automatically calculate some of the parameters
1. First enter mms and cms then click in fs which will then be calculated
In the tutorial, fs but not cms is provided.
2. Enter sd, bl and re
3. Enter Rms or Qms
If you only have one, then click on the other after entering, so it will be calculated
4. Enter xmax and PE
This is required for max SPL charts. If you don't have the power handling, you might make a reasonable guess. You might also choose to enter "music power" which is typically twice the typical nominal RMS rating.
5. Do a quick check of Qts, VAS and SPL to see that they are reasonably close to the specs. Don't worry about small changes as they aren't critical.
Note: Don't enter Le (voice coil inductance). Often this will result in simulations showing early roll off. Some drivers have a fairly high inductance of around 4mH. This will cause significant roll off much greater than measurements show. A null value here is usually more accurate.
Posted by Paul Spencer