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Old 5th March 2006, 04:33 PM   #1
reins is offline reins  Germany
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Default Waveguide and bafflestep

Hi,

as I'm playing around with waveguides for the tweeter, a question comes to my mind:
if I use a waveguide for the tweeter, the sound has a higher directivity and therefore might not see the Baffle any longer. SO, no influence of the baffle dimension in the frequence range of the tweeter.

Is that a valid conclusion?

Stephan
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Old 5th March 2006, 11:49 PM   #2
lndm is offline lndm  Australia
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As long as the waveguide is large enough to act as the baffle down to your frequency of interest.

Imagine rings of sound (domes actually) riding out of the waveguide on its surface - like detergent bubbles.
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Old 6th March 2006, 02:35 PM   #3
reins is offline reins  Germany
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Let's assume a 6" waveguide, from which frequence on baffle diffraction effects might be significantly reduced?

Stephan
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Old 7th March 2006, 02:00 AM   #4
lndm is offline lndm  Australia
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Take the speed of sound (344m/s), divide by the circumference of the mouth. This will give the frequency (give or take an octave for good measure), below this the waveguide will effectively disappear.

You also cannot reproduce low frequencies unless the length (from cone/dome toward you) is significant compared to a wavelength of the frequency of interest.

Try 'Hornresp' by David J McBean. Create a virtual horn that resembles your waveguide.
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Old 7th March 2006, 04:49 PM   #5
reins is offline reins  Germany
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Quote:
Originally posted by lndm
Try 'Hornresp' by David J McBean. Create a virtual horn that resembles your waveguide.
Good idea, I wasn't aware that Hornresp could calculate the directivity. The result wasn't as expected, directivity is not significant in the range between 1kHz and 10kHz (-2 dB at 1kHz down to -6dB at 10kHz at 80 off-axis)

Stephan
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