Tweeter question

[Avondalenaim]

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

 

[JonSnell Electronic]

I would say decoration.
Good way to advertise for that store.

 

[Avondalenaim]

Nothing to do with phase then ?

 

[AllenB]

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.

 

[Avondalenaim]

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

 

[Avondalenaim]

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"

 

[AllenB]

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.