At which frequency bass become no more directionnal ? - diyAudio
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Old 19th November 2012, 04:41 PM   #1
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Default At which frequency bass become no more directionnal ?

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At which frequency bass become no more directionnal and become mono ?

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Gaetan
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Old 19th November 2012, 05:21 PM   #2
jwmbro is offline jwmbro  United States
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Hi gaetan,
This depends on the size of your woofer. The bigger the woofer, the deeper the frequency can be made to be directional. Therefore it is hard to say an exact number. Anything below 100Hz is almost certainly omnidirectionally radiated from nearly every commercial woofer.
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Old 19th November 2012, 05:35 PM   #3
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Hello

You mean that the smaller the woofer are and the higher are the frequency where it become omnidirectional ?

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Gaetan
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Old 19th November 2012, 06:43 PM   #4
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Quote:
Originally Posted by gaetan8888 View Post
You mean that the smaller the woofer are and the higher are the frequency where it become omnidirectional ?
Gaetan
Gaeton,
That is correct.
An 18" diameter speaker will show signs of directivity as low as 60 Hz, while a 8" will be omni more than an octave higher.

Horn speakers and cabinets with large frontal area have more directivity than the same speaker in a small front loaded box.

Shallow crossover slopes allow a sub to play frequencies above where they are omni, it is harder to locate a sub using a 100 Hz 24 dB per octave rate, while the same sub with a 100 Hz 6 dB per octave acoustic crossover would be easy to locate.
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Old 19th November 2012, 07:38 PM   #5
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it *never becomes mono*.

at lower frequencies it *radiates* omnidirectionally.

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Old 19th November 2012, 07:51 PM   #6
jcx is offline jcx  United States
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hm, 60 Hz ~= 16 ft wavelength, most home listening in "acoustically small" rooms the room modal response is bigger factor
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