[HAM] V21 Drivers

[Keith H Clark]

Dave,
     Yup,semantics I suspect. That 'faceplate' in that particular
construction is also the 'phase plug'. The cork piece would be also if the
audio passed through it, but it doesn't so it's just a plug. I have seen
other drivers with that orfice open. (Responses--be careful!! ) ha ha

-----Original Message-----
From: hammond-bounces at zeni.net [mailto:hammond-bounces at zeni.net] On Behalf
Of David Anderson
Sent: Monday, June 09, 2008 10:16 AM
To: The Hammond Forum
Subject: Re: [HAM] V21 Drivers


Keith,

I'm not sure if we disagree or if it's an issue of semantics.

The V21 faceplate may have a phase plug built into it, but the  
primary purpose of the faceplate is to hold the diaphragm in place.

In other words, you could have a faceplate without a phase plug, as  
many dome tweeters do, but with no faceplate, what keeps the  
diaphragm where it's supposed to be?

Maybe my question for Jordan is: are you looking for the whole  
plastic assembly that screws to the metal magnet structure, or are  
you looking for the little cork-shaped thing that is stuck into the  
larger plastic assembly?

In the first case, you'd probably have to buy a non-working V21 for  
parts; in the second case, you should probably be able to fashion one  
using an existing one as a guide.

David

On Jun 9, 2008, at 5:46 AM, Keith H Clark wrote:

> Dave,
>     That black plastic piece on the Jensen V21 that covers the  
> diaphragm IS
> the phase plug. It acoustically aligns all the frequencies  
> emanating from
> the diaphragm into a coherent wavefront to exit the driver.
> In an Altec driver, the phase plug in the later ones is that orange  
> piece
> with the radial slots in it. In the earlier ones, they were  
> circumferential
> slots machined into the metal. In both cases, the sound passes  
> through those
> phase plugs,as in the Jensen driver where it exits 'the slots'  
> after being
> compressed and aligned to enter the horn throat.
> m.com/
> Beta Forum Port: http://www.hammondforum.com/forum/
>

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