Active cardioid simulation

[focoz]

Hello everyone, I'm trying to understand how simulation works in VituixCAD. I started with the measurements on the IEC panel provided by the manufacturer, I then rechecked the measurements with the Trace tool to integrate the low-frequency range and the diffraction of the panel using the Merger and Diffraction tools in Vituix.


After that, I created the active crossover filter and arrived at the result I am posting. The goal is to create a project as mature as possible with the most accurate simulation, then move on to the actual construction, supported by measurements that will be verified and compared with those from the simulation.


I’m attaching some images to show you the preliminary version of the simulation.


One thing that’s not clear to me is how to use the Diffraction tool with multiple measurements extracted from the datasheet. Let me explain better: if I "capture" the response at 0°, 30°, and 60° with Trace, how can I use them all with the Diffraction tool, considering that even just using the measurement at 0° it calculates the directivity from 0 to 180°?


A few words about the project... the enclosure will be a stand-mount speaker, slightly over 40cm tall, with a depth of about 35cm and a width of 20cm. It will have a tweeter and a midwoofer mounted on the baffle and two subwoofers on the two side panels. For the tweeter, I’ve chosen the Scanspeak D3004/6600 since I already own it (I’d like to evaluate it with and without a waveguide in the further stages of the project), the midwoofer is the SB Acoustics SB15NBAC30-8, and for the two subwoofers, I’m using the Dayton Audio DCS205-4 8-inch drivers.


I hope I can use this project to understand how far one can push in simulating a rather complex speaker, and maybe inspire some of you to offer me some valuable advice.

Grazie
Stefano

 

[Richard G]

Did you find out elsewhere, in particular Is there a VituixCAD forum?

If you learn of it, please share the link here … to add value to this thread, for anyone who comes here

When I get time I’d like to learn and use it. I suspect I will will struggle with some of it.

For such a powerful piece of software, a helpful forum could be a godsend. Or more accurately a saviour

 

[tmuikku]

Hi,
Read VituixCAD manual, various threads in diyaudio.com. I think official thread is in htguide forum. Some threads also on here I bet.

You really need to build the box and measure.You can get some preliminary data like that, but the end result coukd be way off depending on accuracy of the manufacturer data and your skills to make sure there are no mistakes in the process.

Diffraction tool is very simplified and mainly to introduce effect of baffle, not directivity of a transducer, which you have to measure anyway. It's great tool though to learn about directivity in general, about diffraction in general, how physical size and wavelength relate. Just use no data to have ideal transducer to learn this stuff. Soon you'll learn to simulate simple shapes and setups in your brain. More intrigue shapes need simulation, like good horns and waveguides.

ps. by far trickiest part in loudspeaker tweaking is getting proper measurement data. Except caveats, errors and so on, always verify your end result. Read and practice and think. I've done numerous measurements (no klippel) at home, must be several hundred hours worth, and still stumble on errors in the process. Simulation result is limited jy quality of the data.

Have fun!

 

[Richard G]

Hi,
Read VituixCAD manual, various threads in diyaudio.com. I think official thread is in htguide forum. Some threads also on here I bet.

You really need to build the box and measure.You can get some preliminary data like that, but the end result coukd be way off depending on accuracy of the manufacturer data and your skills to make sure there are no mistakes in the process.

Diffraction tool is very simplified and mainly to introduce effect of baffle, not directivity of a transducer, which you have to measure anyway. It's great tool though to learn about directivity in general, about diffraction in general, how physical size and wavelength relate. Just use no data to have ideal transducer to learn this stuff. Soon you'll learn to simulate simple shapes and setups in your brain. More intrigue shapes need simulation, like good horns and waveguides.

ps. by far trickiest part in loudspeaker tweaking is getting proper measurement data. Except caveats, errors and so on, always verify your end result. Read and practice and think. I've done numerous measurements (no klippel) at home, must be several hundred hours worth, and still stumble on errors in the process. Simulation result is limited jy quality of the data.

Have fun!

thank you for your several good tips

Much appreciated