Since I have fixed on Holm as my measurement system, I curious if any of the sims out there will do complete polar maps from either measured data of simulated data. Basically what I mean is lets say you have one driver as measured data, but want to sim the other driver to investigate options. Can anything out there handle a full set of polar data with crossover in such a situation? Where I am at right now I could make software to do this, but I have no interest in doing so if something already exists that can handle this. To me, unless you are dealing with polar responses like I show in my "polar_map" software, you are not getting good enough data for the simultation to be useful.
Vacs?
Vacs - Home
I've not downloaded it, but the viewer is free with documentation - so it's a start. 😱
I fully agree about not getting enough data with out polar responses. The one software package I can think of that should do what you want is LEAP5.
The format that LEAP uses is like this and can be vertical or horizontal (you may or may not like the format):
An externally hosted image should be here but it was not working when we last tested it.
You can add another driver's response as what they call a guide curve. I don't know how you would add actual measured data to the polar plot mix and I have not done that (just with on-axis plots). If you want to know how it is done or even if it can be done, then contact Chris at LinearX.
It would be a powerful tool if you can, but there is another approach.
The claim by LinearX is that their method for transducer driver modeling is pretty close to the real thing. They ran some extensive comparative testing of modeled versus actual measured data with very good results.
The method they use to get the driver data goes beyond the normal T/S parameters. So, if you do the measurement of the raw driver correctly you should have a very representative model in the software.
Couple the driver model with their diffraction engine and you get a powerful tool for modeling just about anything with good results.
I think the software is good enough in that regard to at least allow you to determine if it is worth building a physical prototype to confirm the results.
LinearX's philosophical approach to your requirement is to let you create "highly" accurate transducer models of the drivers you want to compare. Then model each those in the software. Then combine the results using 'guide curves' to analyze the different possibilities.
This I have done this myself, to the extent of confirming it for a dry run. It works. My next step is to run a real world example between the drivers I have now and a new set of drivers (once they arrive at my door) by measuring those drivers and making a working model.
As I said, I can't make any claims as to how accurate this approach is in the real world and your results may vary.
LEAP5 is not cheap (unless you can find a deal like I did), but the actual cost from a business perspective can be small compared to the time and material the tool saves without it.
There is also a learning curve using the tool. I would rank it as moderate and something you should easily be able to do. LinearX provides good on-line tech support.
If all you need is to do transducer modeling in enclosures, Enclosure Shop can be purchased separately without Crossover Shop.
On a side note, I think CLIO allows some pretty expansive 3-D renditions of measured data polar responses. Actually, they allow a full vertical and horizontal rendering at the same time.
Last edited: