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Multi-Way Conventional loudspeakers with crossovers

Tweeter question
Tweeter question
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Old 17th November 2019, 10:30 AM   #1
Avondalenaim is online now Avondalenaim
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Default Tweeter question

Hello

Please see the picture of a tweter i have

Google Image Result for https://cdn.shopify.com/s/files/1/0809/2387/products/B_W_tweeter1a_2000x.jpg?v=1571155022

I was wondering what the purpose of the ring around the outside edge is with the holes in it.

Also the ridges - are they there for any reason apart to get grip to screw the tweeter out of the baffle ?

Many thanks in advance
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Old 17th November 2019, 10:38 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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I would say decoration.
Good way to advertise for that store.
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Old 17th November 2019, 10:52 AM   #3
Avondalenaim is online now Avondalenaim
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Nothing to do with phase then ?
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Old 17th November 2019, 12:47 PM   #4
AllenB is offline AllenB  Australia
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Almost looks as though it's for shading, a form of diffraction control, as if it is not expected to fill to the inner edge beside the dome, but I'm just speculating.
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Old 17th November 2019, 01:16 PM   #5
Avondalenaim is online now Avondalenaim
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Just found the B&W service manual and the parts list describes it as a phase ring.

I would love to know what it actually does
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Old 17th November 2019, 01:25 PM   #6
Avondalenaim is online now Avondalenaim
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Found the quote below in Sreeophile talking about the B&W Nautilus 801 which is not my speaker (P4) but must be a similar concept.


"The 1" metal-dome tweeter employed a "phase ring" to optimize the unit's dispersion. However, many listeners blamed this ring for reducing the speaker's sense of openness"
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Old 17th November 2019, 09:10 PM   #7
AllenB is offline AllenB  Australia
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Descriptive words are so easy to misinterpret. Openness seems to be the opposite of directive. On the other hand I don't associate openness as having anything directly to do with directivity. So I wouldn't see this review as informative.
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