How are phase plugs sealed?

454Casull · 16th May 2004, 07:57 PM

There isn't any air leakage around a dust cap, but aren't phase plugs directly attached to the pole piece? What seals the gap between the voice coil former/cone and the pole piece?

sreten · 16th May 2004, 08:10 PM

Nothing, thats the point, the plug is fixed,
do not approach with iron filings

,

sreten.

5th element · 16th May 2004, 08:23 PM

I think the question may have been what stops the air from escaping the box thru the small air gaps presented by a phase plug, you know the small gap of coil between teh pole piece.

Nothing however I think is done. Simply the drivers dont produce enough pressure to force air out thru such a tiny gap, along the huge air path it would also have to take. Would provide good cooling me thinks of the coil tho

454Casull · 17th May 2004, 12:23 AM

Hmm... I was thinking a thin membrane of latex might be used. Oh well, you learn something new every day.

Timn8ter · 17th May 2004, 03:41 AM

Many dust caps breathe don't they?

5th element · 17th May 2004, 01:19 PM

Quote:

Originally posted by Timn8ter
Many dust caps breathe don't they?

That is indeed true.

I dunno if anyone has actually done this cept me, but the phase plugs on SE drivers are NOT fixed, they are screwed in and can be removed. That billet of nice copper you see does not extend all the way down to the pole piece, it goes to just below the front of the voice coil so it looks like it does. Behind the solid bit is a cylinder of copper which extends to the polepiece.

Pics of dissection process

First up is me pushing the cone back a little bit, you can see the two seperate peices. Next is the bullet bit removed. Standby for next pics

5th element · 17th May 2004, 01:23 PM

Next is the copper ring removed, and then finally both the plug and the ring seperately.

Vikash · 17th May 2004, 04:27 PM

Hi Matt, nice detailed pics. I can't see how the copper ring stays in place. It looks like its free to rub against the former. Or does is rely on the phase plug to keep it in place when screwed tight?

djQUAN · 17th May 2004, 05:16 PM

it looks like there is a machined portion on the pole piece that the copper ring goes onto so it is centered and it won't move. then again, I may be wrong..........

5th element · 17th May 2004, 05:27 PM

Quote:

Originally posted by djQUAN
it looks like there is a machined portion on the pole piece that the copper ring goes onto so it is centered and it won't move. then again, I may be wrong..........

You are indeed correct. There is also a machined section of the phase plug too, so the section at each end keeps the ring in place.

16th May 2004, 07:57 PM	#1
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	How are phase plugs sealed? There isn't any air leakage around a dust cap, but aren't phase plugs directly attached to the pole piece? What seals the gap between the voice coil former/cone and the pole piece?

16th May 2004, 08:23 PM	#3
5th element diyAudio Member Join Date: Oct 2002 Location: England	I think the question may have been what stops the air from escaping the box thru the small air gaps presented by a phase plug, you know the small gap of coil between teh pole piece. Nothing however I think is done. Simply the drivers dont produce enough pressure to force air out thru such a tiny gap, along the huge air path it would also have to take. Would provide good cooling me thinks of the coil tho __________________ What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack!

17th May 2004, 04:27 PM	#8
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	Hi Matt, nice detailed pics. I can't see how the copper ring stays in place. It looks like its free to rub against the former. Or does is rely on the phase plug to keep it in place when screwed tight? __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

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16th May 2004, 08:10 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Nothing, thats the point, the plug is fixed, do not approach with iron filings , sreten.

17th May 2004, 12:23 AM	#4
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Hmm... I was thinking a thin membrane of latex might be used. Oh well, you learn something new every day.

17th May 2004, 03:41 AM	#5
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	Many dust caps breathe don't they?

17th May 2004, 05:16 PM	#9
djQUAN diyAudio Member Join Date: May 2004 Location: manila	it looks like there is a machined portion on the pole piece that the copper ring goes onto so it is centered and it won't move. then again, I may be wrong..........

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