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space behind spider: sealed vs open

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#1
Which is more common?

[1] The space behind the spider is sealed.

[2] The space behind the spider is open.
 

solderdude

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#2
I assume with spider you meant the plastic foamy retainer in the HD6** series ?

In that case I would say there has to be an open space behind the spider otherwise the driver would be over-damped and bass be rolled off and most likely linearity would be out the door.
When the question is whether the headphone is 'open' behind the driver then this depends on many factors in the design. There is fully open without acoustical feedback from rear to front, there is fully open with acoustical feedback from the rear. There is 'half open' and there is 'closed' but this can be in several degrees. Then there is the D8000 which is open but the space behind the actual driver is closed by a membrane.

When you mean the hole behind the driver magnet then the answer is: That depends on the diameter of the hole, the damping of the cone, the amount of damping that is needed and the application of the driver.

Or did you mean the space between the (often yellow) spider for aligning the cone/voicecoil of speakers to the gap of a loudspeaker ?
 

RayDunzl

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#3
Is it not common for the spider to be constructed of a porous material?
 

Doodski

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#4
In that case I would say there has to be an open space behind the spider otherwise the driver would be over-damped and bass be rolled off and most likely linearity would be out the door.
I'm apparently not up to speed on the various types of electronics linearity definitions. I have always considered linearity as a load line but in your comment you are I think defining it as frequency response. Is that correct?
 
OP
S
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Thread Starter #5
I meant the wrinkly thing, but other than the surround, that holds the cone in place.

The picture is an example where the space behind the spider is open.
Opera Snapshot_2020-08-05_151152_www.youtube.com.png
 
OP
S
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Thread Starter #6
Examples where the space behind the spider is sealed.
1024px-FullRangeSpk.svg.png
Opera Snapshot_2020-08-05_151637_www.youtube.com.png
 

solderdude

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#7
Ah.. I am too focused on headphone drivers I guess.

I figure that would depend on spider materials used, whether or not it plays a specific part in damping, expected swing it must allow and thoughts/experiences with the construction of the one designing the driver I reckon.
 
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