Re: How to Design Loudspeakers without Performing Measurements
I know Dave put a lot of work into his tutorial, but he chose a much more diffcult path for modeling. I'm not sure why, I suspect he just went with what he was familiar with. However, there is a much easier way to do it, that's more intuitive too.
I designed the Response Modeler in an effort to consolidate most of these steps in a simple, but accurate format. I never use SPL trace, but I do some modeling or drivers that I don't have. I use the features in the upper section of the RM to progressively add detail and extend the response to create a reasonable facsimile of a driver's response curve - some with a lot of detail.
Next I model the box response, adjust its level to match, and splice it on. While doing so, I model the impedance curve. I spent a lot of time developing the math to very accurately reproduce the affects of Le that changes with frequency like in real loudspeakers. You will find my modeled impedance to be capable of very accurate results.
After the box response I model the cabinet diffraction and add that to the response. Finally, I save this out as an frd file and the impedance as a zma file and then extract the minimum phase from them.
It's simple and it works very effectively.
I am not sure why Unibox was chosen for this process. It is an excellent box modeler, but my WB&CD uses the same math an produces results that match for most modeling. However, my WB&CD can be adjusted for any frequency range, even 10-20kHz and includes my impedance algorithm for a more accurate Le. I'm not really pleased with the way it is described on the webpage linked above. I think I need to ask Charlie to change that. I don't like it being thought of as a "Subwoofer designer". That's why I changed its name a few years ago to remove Subwoofer from the title. It models subwoofers, but it can model tweeters too.
I guess I need to create a tutorial for using my software together, as I intended it to work, and how I use it myself. More than one view can sometimes be helpful.
Jeff B.
Originally posted by donradick
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I know Dave put a lot of work into his tutorial, but he chose a much more diffcult path for modeling. I'm not sure why, I suspect he just went with what he was familiar with. However, there is a much easier way to do it, that's more intuitive too.
I designed the Response Modeler in an effort to consolidate most of these steps in a simple, but accurate format. I never use SPL trace, but I do some modeling or drivers that I don't have. I use the features in the upper section of the RM to progressively add detail and extend the response to create a reasonable facsimile of a driver's response curve - some with a lot of detail.
Next I model the box response, adjust its level to match, and splice it on. While doing so, I model the impedance curve. I spent a lot of time developing the math to very accurately reproduce the affects of Le that changes with frequency like in real loudspeakers. You will find my modeled impedance to be capable of very accurate results.
After the box response I model the cabinet diffraction and add that to the response. Finally, I save this out as an frd file and the impedance as a zma file and then extract the minimum phase from them.
It's simple and it works very effectively.
I am not sure why Unibox was chosen for this process. It is an excellent box modeler, but my WB&CD uses the same math an produces results that match for most modeling. However, my WB&CD can be adjusted for any frequency range, even 10-20kHz and includes my impedance algorithm for a more accurate Le. I'm not really pleased with the way it is described on the webpage linked above. I think I need to ask Charlie to change that. I don't like it being thought of as a "Subwoofer designer". That's why I changed its name a few years ago to remove Subwoofer from the title. It models subwoofers, but it can model tweeters too.
I guess I need to create a tutorial for using my software together, as I intended it to work, and how I use it myself. More than one view can sometimes be helpful.
Jeff B.
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