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Multi-Way Conventional loudspeakers with crossovers

Do some tweeters intentionally have a peak at around 10KHz?
Do some tweeters intentionally have a peak at around 10KHz?
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Old 30th June 2017, 03:37 PM   #1
andy2 is offline andy2  United States
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Default Do some tweeters intentionally have a peak at around 10KHz?

I don't know if this is true but some tweeters have a slight depress at around 3K - 7K, but then have a slight peak at around 10KHz. I think sibilance is in the 3K - 7K region. At around 10Khz, it's not sibilance but more like what audiophiles call "air". So I don't know if this is intentionally done to add an extra sense of "air" without increasing the sibilance. I am not sure I like this approach though since I think any intentionally emphasis in any freq. response would make the sound less natural.
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Old 30th June 2017, 06:39 PM   #2
TBTL is offline TBTL  Germany
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Interesting question. I cannot answer it, but I know this: many tweeters are 1" soft domes. Those have a resonance at their lower cutoff (~1 kHz) at which the dome moves as a rigid body. This can cause a bump at that frequency. Modes of the dome itself start at 6 kHz if I remember correctly, so one of these could cause a peak at 10 kHz. Those usually are well damped, but still one of them can show up in a graph. Furthermore, above ~5 kHz a 1" dome starts to beam, increasing the on axis sound level as those high frequencies are forced forward.

A broad bump at 1 kHz and a narrow one at 10 kHz somewhat matches your description.

Last edited by TBTL; 30th June 2017 at 06:50 PM.
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Old 30th June 2017, 08:28 PM   #3
454Casull is offline 454Casull  Canada
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Probably not. Are you possibly referring to diffraction artifacts?
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Old 30th June 2017, 08:45 PM   #4
rongon is offline rongon  United States
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Do some tweeters intentionally have a peak at around 10KHz?
The Vifa / SEAS tweeters used in the 1990s Snell Acoustics speakers had a response peak in the vicinity of 10kHz. FWIW...

Click the image to open in full size.

"Snell E/III, anechoic response on tweeter axis at 44" (black), corrected for microphone response, with individual responses of the tweeter (red), woofer (blue), and port (green), measured in the nearfield below 300Hz." (From a review in Stereophile Magazine)

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Old 1st July 2017, 02:52 PM   #5
Lojzek is offline Lojzek  Croatia
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Broad bumps at 1 kHz are due to a higher Qts which in itself is not an issue if you know how to design HP filters. An example is SS D3004/604000. Standing waves at 10 kHz calculate to 1,7 cm so maybe not adequately stuffed rear chamber.
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Last edited by Lojzek; 1st July 2017 at 02:55 PM.
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Old 1st July 2017, 02:55 PM   #6
HumbleDeer is offline HumbleDeer  Belgium
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I think 10K bumps might also induce some imaging-preferred effect. They're not good for monitors, however.
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