Sorry for the typo in the title - it sould be monopol / cardioid bass mode
Hi all,
i have read quite closely the ASR thread;
https://audiosciencereview.com/forum/index.php?threads/ggntkt-model-m1.12959/
and have tried to copy the idea and run a simulation with BoxSim ( i am used to it since a decade, i know that VituixCAD is better but i am no good with it)
I have attached the BPJ file zipped in an archive for those who want to play around with BoxSim, i use the V2.1 DE Version, the file should work also with the V2.0 EN Version
The monopole mode is a piece of cake to simulate, bur i was wondering what have to be done to get the cardioid mode to run that is much better when the speaker need to stand very close at the wall. I have taken the speaker chassis available for BoxSim from Visaton, in VituixCAD the simulation could be done much more closer to the original using the original SB Acoustics 6.5 inch woofer, but it will be difficult to have a decent simulation of the Celestion compression driver mounted in the proprietary 120 X 100 degree directivity pattern waveguide.
As soon as i have understood what have to be done to get the bass cardioid mode to run i would try something similar with some KEF coax chassis that i have - KEF SP1753 4.5 inch as mid high coax that would need three additional woofer or KEF SP1716 8 inch that would need only the rear woofers in addition.
Hope to find some fellows interested in this topic!
- Stefano
Hi all,
i have read quite closely the ASR thread;
https://audiosciencereview.com/forum/index.php?threads/ggntkt-model-m1.12959/
and have tried to copy the idea and run a simulation with BoxSim ( i am used to it since a decade, i know that VituixCAD is better but i am no good with it)
I have attached the BPJ file zipped in an archive for those who want to play around with BoxSim, i use the V2.1 DE Version, the file should work also with the V2.0 EN Version
The monopole mode is a piece of cake to simulate, bur i was wondering what have to be done to get the cardioid mode to run that is much better when the speaker need to stand very close at the wall. I have taken the speaker chassis available for BoxSim from Visaton, in VituixCAD the simulation could be done much more closer to the original using the original SB Acoustics 6.5 inch woofer, but it will be difficult to have a decent simulation of the Celestion compression driver mounted in the proprietary 120 X 100 degree directivity pattern waveguide.
As soon as i have understood what have to be done to get the bass cardioid mode to run i would try something similar with some KEF coax chassis that i have - KEF SP1753 4.5 inch as mid high coax that would need three additional woofer or KEF SP1716 8 inch that would need only the rear woofers in addition.
Hope to find some fellows interested in this topic!
- Stefano
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I have found an article about some theory, but it is in German
https://eventelevator.de/storys/gerichtete-subwooferanordnungen/
Anyway there is a good picture where we can see what GGNTKT is doing in a very small package when the box run in cardioid bass mode
more or less accurate translation
the 80 Hz reverse SPL attenuation with the cardioid subwoofer array is clearly visible in the polar diagram
One problem of BoxSim ist that it is not possible to simulate a back wall behind the speaker
https://eventelevator.de/storys/gerichtete-subwooferanordnungen/
Anyway there is a good picture where we can see what GGNTKT is doing in a very small package when the box run in cardioid bass mode
more or less accurate translation
the 80 Hz reverse SPL attenuation with the cardioid subwoofer array is clearly visible in the polar diagram
One problem of BoxSim ist that it is not possible to simulate a back wall behind the speaker
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