Hi
I intend to put a 12” AE Dipole woofer on an OB which will be about 56cm wide by say 50 cm tall. I will also put some short wings on the baffle. I will run the woofer up to 600hz. I have read what Linkwitz has to say about diffraction and I want to just check I’ve understood correctly. The wavelength at 600hz is 57cm, so I’ve concluded that edge diffraction should not be an issue. Have I got that right?
I intend to put a 12” AE Dipole woofer on an OB which will be about 56cm wide by say 50 cm tall. I will also put some short wings on the baffle. I will run the woofer up to 600hz. I have read what Linkwitz has to say about diffraction and I want to just check I’ve understood correctly. The wavelength at 600hz is 57cm, so I’ve concluded that edge diffraction should not be an issue. Have I got that right?
In what regard, because there are a few different ways I could think of to view this problem. Could you link to what SL says about this so we could see it in context?
Would I be correct saying that Fequal would be around 100Hz and the first modal null would happen at 600Hz?
A different approach to consider.. you have a driver with a cone approximately 26cm wide and a baffle around double that.
According to the attached image (from here) ka=1 at around 420Hz. Your plot of interest is going to be b=2a. This appears to make Fequal around 255Hz (or possibly higher out from under the modal behaviour if I'm reading it correctly, or lower due to the baffle being larger than if it were round), and the first modal null around 1240. If it is on the floor then this should be considered.
With regard to the wing depth, this plot clearly shows the general effect of using a larger baffle in an otherwise same situation.
According to the attached image (from here) ka=1 at around 420Hz. Your plot of interest is going to be b=2a. This appears to make Fequal around 255Hz (or possibly higher out from under the modal behaviour if I'm reading it correctly, or lower due to the baffle being larger than if it were round), and the first modal null around 1240. If it is on the floor then this should be considered.
With regard to the wing depth, this plot clearly shows the general effect of using a larger baffle in an otherwise same situation.
