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Speaker directivity
In article ,
Chris Berry wrote: Say I have a cone with a 6" radius back against a wall. How do I calculate, roughly at which frequency it starts to radiate sound to the back? It's only the cabinet resonance that gets radiated to the back so it's a pretty moot point. The only other way you'll get sound radiated behind the speaker is using open back cabs or have something reflect the sound back at the speaker - Only the open back cab will do this effectively and then you're stumped for high frequencies... With a monopole speaker the rear output will essentially match the front once your wavelengths are 3X baffle width, and there's some effect with wavelengths as short as 1/3 width. In free-space you get a 6dB drop in on-axis SPL when this happens. This is why speakers need baffle step compensation. -- a href="http://www.poohsticks.org/drew/"Home Page/a Life is a terminal sexually transmitted disease. |
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