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Old Today, 03:45 PM   #7501
gedlee is offline gedlee  United States
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Quote:
Originally Posted by mabat View Post
That's just tied to the amplitude response, i.e. there's simply a resonance somewhere inside the driver.
That's the diaphragm resonance - surprisingly low damping for a compression driver.
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Old Today, 03:54 PM   #7502
mabat is offline mabat  Czech Republic
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Oh, I see. BTW, this is the throat impedance of the WG used. So is there a chance that in a waveguide that has a higher throat impedance to a lower frequency, the dip between 1 - 2 kHz won't be as pronounced?

-swg33-throat-impedance-png
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Old Today, 04:18 PM   #7503
ErnieM is online now ErnieM  United States
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Here's another measurement of the HF1440 I forgot about.

HF1440 New Ring Compression Driver from Faital Pro.
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Old Today, 04:22 PM   #7504
mabat is offline mabat  Czech Republic
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Thanks. So we want a horn with throat impedance peaking just above the fundamental driver resonance, don't we. Damn, this calls for a lumped-element model of the driver.
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Old Today, 07:33 PM   #7505
gedlee is offline gedlee  United States
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AS you might expect, the coupling of the elements around resonance can get complex and unintuitive. Models are usually required.

But at these L(ish)Fs the waveguides impedance looks like a simple mass. The dual humps in the electrical impedance curve are due to the coupled oscillator defined by the gap compliance and the two masses - waveguide and diaphragm. At the lower impedance you have the two masses in phase and the above peak they are out of phase, i.e. 180 degree phase shift. This coupling makes the whole problem much more complex.
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