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Cardioid setup questions |
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Foca_Dacian 
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Joined: 05 February 2011 Location: Romania,Cluj Status: Offline Points: 118 |
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 Topic: Cardioid setup questionsPosted: 24 October 2017 at 3:48pm |
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Can you have cardioid setups with any type of subs (enclosure design)?
Does it have to be a 1 to 1 ratio (sub facing the crowd/sub facing the stage)? If you have a 2 to 1 ratio (2 subs facing the crowd/1 sub facing the stage)will the attenuation in the baclk be 6 dB less?
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snowflake
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Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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Posted: 24 October 2017 at 4:37pm |
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cardioid has a very specific meaning but people often use it to mean any speaker or array with low frequency directivity. I'm no expert but the delta array discussion on here a few years ago seemed interesting. depending on where the stacks and stage are you might want to look at side attenuation as well as rear attenuation.
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Jo bg
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Joined: 08 March 2017 Status: Offline Points: 552 |
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Posted: 24 October 2017 at 5:51pm |
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hi
as suggested Rog Mogale has a good paper on bass management and steering but there are many, and i noticed not everybody uses the same name for the same thing... csa, cardioid, gradient array... regarding the ratio, end fire arrays use the same ratio front/back but could have more than two speaker in a row, the more speaker the more the effect (until 4 in a row, after that don't ask me....); basically, without polarity reversals or speaker rotation, you just delay the front speaker 1/4 Wavelength to the back speaker and put another 1/4 wavelength of distance between the two, so in front they sum coherently and in the back they have 1/2 wavelength separation, that means maximum cancellation. note that you must choose a center frequency (40 - 60 Hz) for the cancellation and it will be less effective on other freqs. cardioid (or how you want to call it) usually is a 2:1 front to back ratio, but by the time the front speaker sound meets the back one it has lost energy due to distance travelled so the difference is not that much. here basically you align the back speaker to the front with delay and once you have maximum summation you invert the back speaker polarity to get the cancellation behind the stack. forum wisdom says cardioid is more effective but impact the quality of the sound more than endfire. get a free software like danleys to get a feel on how arrays of subs work. |
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Conanski
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Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2537 |
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Posted: 24 October 2017 at 5:52pm |
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Jo bg
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Posted: 24 October 2017 at 5:57pm |
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sorry i forgot! I think you can do it with any kind of enclosures, but they have to be the all the same (if you are not going to make the amplitude and phase match with dsp)
i read reports about arrays of directional speakers like horns being more effective than arrays of more omnidirectional speakers, but take it as a rumor until someone puts some science in it. note that advanced cardioid setups used inside pro speakers may use different drivers front(bigger) and back(smaller), but they are carefully matched and processed. |
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Foca_Dacian wrote: