Driver pattern, directivity and other confusing issues - diyAudio
 Driver pattern, directivity and other confusing issues
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 Multi-Way Conventional loudspeakers with crossovers

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 18th January 2006, 12:10 AM #1 diyAudio Member   Join Date: Apr 2002 Driver pattern, directivity and other confusing issues 1. It is my understanding that a sound pattern emanating from a driver will change with changing frequency, specifically narrowing with increasing frequency. I also seem to recall, that the narrowing is dependent on the driver dimensions. I was wondering if there are any references, describing how this change in pattern depends on the driver dimensions and frequency. In other words, given a dimension of a sound radiating surface of the driver and a frequency, can one predict the pattern? 2. It is my further understanding that the change in pattern can be controlled by a waveguide; however, the pattern will be controlled only down to a certain frequency [1] according to a formula: Fc= 10^6/(theta*X) where: theta is the included angle of the waveguide; X is the mouth width of the waveguide [in]. I fail to understand how to apply this formula to a waveguide that has several included angles a la MantaRay, or a curved mouth section a la Geddes. Should anyone know an answer, I would appreciate it. Thank you, M
 18th January 2006, 05:17 PM #2 diyAudio Member   Join Date: Apr 2004 Location: Texas http://www.pvconsultants.com/audio/radiation/arpe.htm This program can assist you in estimation of the effects of frequency and driver radius. You can also find a spreadsheet that does something similar in the Unofficial Speaker Workshop Manual downloadable at www.audiodiycentral.com. I believe it is in section 5 or 6. Jay
 19th January 2006, 03:56 AM #3 diyAudio Member   Join Date: Apr 2002 Thank you very much Jay. M

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