Hi, I simulated a simple cardioid with two sources separated by 50mm. I thought I will get front beam width of 90 degrees but I got 180 degrees😕.
Why? Can somebody pls explain?
What should I modify to get front lobe of 90 degrees?
Thanks, Warm Regards,
WonderfulAudio
Why? Can somebody pls explain?
What should I modify to get front lobe of 90 degrees?
Thanks, Warm Regards,
WonderfulAudio
Last edited:
You can rotate the cancellation sector from more or less behind the speaker to sides by adjusting the delay. Basically you'll end up something dipole. You should likely use a waveguide if you need 90deg pattern on front and not luch sound to the back.
These cardioidish patterns are quite nice to save space on long wavelengths, which would require big waveguide.
90deg is just a number, what is your objective perceptually?
These cardioidish patterns are quite nice to save space on long wavelengths, which would require big waveguide.
90deg is just a number, what is your objective perceptually?
Hi Tmuikku, Thanks for your input. Since a cardioid radiates to +-90 degrees there will be lot of sound going off axis into the room, I dont want that and need a narrower 90 degrees front beam width from an 8 inch woofer, there will be a compression driver on 8 inch waveguide to provide the matching frontal lobe for the highs. Can you pls provide the exact changes I should do to attach model it. Pls see my 203Hz beam width of +-90.2 degrees, now how do I rotate the cancellation sector from more or less behind the speaker? I am interested only in 100Hz to 1Khz, lower than this its futile and above this the 8" woofer is starting to have its own 90 degrees beam width itself. I would like to simulate first.
Thanks and Warm Regards,
WonderfulAudio
Thanks and Warm Regards,
WonderfulAudio
Hi, as such it is an impossible task. DI of 6db is all you can do with this kind of gradient systems, meaning there is some sound to the back, and the front lobe is wider. Also, 100-1000Hz is wide bandwidth and limits system output capability which might be ok or not, not sure your target SPL.
However, these are just physics and you can make wonderful speaker with ~200-1000Hz bandwidth cardioidish pattern, I'm using one in mine. Check out D&D 8c thread for tips try and simulate a "passive cardioid", however, in the end you just have to build it, because simulations are just aproximation. I have posted some vituixcad emulation examples in the thread.
If you want to make it using two drivers, "actuve cardioid", nc535 and fluid have posted simulations for those elsewhere. Some passive cardioid BEM sims also available by vineethkumar and mabat. Likely others as well.
Have fun with your project!🙂
However, these are just physics and you can make wonderful speaker with ~200-1000Hz bandwidth cardioidish pattern, I'm using one in mine. Check out D&D 8c thread for tips try and simulate a "passive cardioid", however, in the end you just have to build it, because simulations are just aproximation. I have posted some vituixcad emulation examples in the thread.
If you want to make it using two drivers, "actuve cardioid", nc535 and fluid have posted simulations for those elsewhere. Some passive cardioid BEM sims also available by vineethkumar and mabat. Likely others as well.
Have fun with your project!🙂