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#95317 - 05/20/05 05:26 PM Rubber vs Foam...
freesey Offline
local

Registered: 06/19/02
Posts: 248
Loc: London, Ontario
No this isnt a kinky question...
Is there a major reason why some companies still use foam surrounds around the driver rather than change ro rubber? What are the advantages or disadavantages between the two? I know the last set of home made boomers I made had foam around the cones (25 watt 8 inchers) and i blew the cone right out of the basket. It was funny. But...any thoughts?
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#95318 - 05/20/05 06:48 PM Re: Rubber vs Foam...
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16259
Loc: Leesburg, Virginia
Most likely it's a cost factor. Foam is cheap.
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#95319 - 05/20/05 07:04 PM Re: Rubber vs Foam...
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17741
Loc: NoVA
My thoughts exactly. Of course, there may be some purists out there who swear by foam. Who knows...
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#95320 - 05/20/05 07:53 PM Re: Rubber vs Foam...
chopa2less Offline
hobbyist

Registered: 12/29/03
Posts: 20
Loc: New Orleans, Louisiana
Rubber is much more durable; foam will deteriorate. This may be especially true in humid climates. Many years ago I owned a cheap pair of speakers with foam surrounds. The surrounds deteriorated in about ten years time. I own a pair of speakers with rubber surrounds that are about 16 years old, and I've had no problems with those.

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#95321 - 05/20/05 08:56 PM Re: Rubber vs Foam...
Wegiz Offline
veteran

Registered: 08/30/04
Posts: 156
Loc: Ann Arbor, Michigan
A friend of mine has a pair of old speakers with nearly completely missing foam surrounds. They still sound pretty good though. Is there an acoustical reason for them?
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#95322 - 05/23/05 04:20 PM Re: Rubber vs Foam...
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16259
Loc: Leesburg, Virginia
They're not supposed to add any sound, if that's what you mean, but they help the speaker cone maintain linear excursion (i.e. prevent any side-to-side motion which would color the sound).
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#95323 - 05/23/05 04:52 PM Re: Rubber vs Foam...
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5279
Loc: Bowmanville, Ontario, Canada
I guess sealing the gap between cone and frame is also a good thing, particularly for air suspension speakers where the compressed air in the cabinet is used to control cone excursion at resonance rather than "back pressure" from a tuned port.

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#95324 - 05/23/05 05:01 PM Re: Rubber vs Foam...
Twebbz Offline
old hand

Registered: 04/16/05
Posts: 61
I had 80's vintage Large Advents until last year. The foam disinigrated after the first ten years. I bought new woofers. Last year the foam started to separate from the cones so I got out the rubber cement and fixed them...then dumped them and bought Athena AS-F2s.


Edited by Twebbz (05/23/05 05:02 PM)
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#95325 - 05/29/05 09:37 PM Re: Rubber vs Foam...
freesey Offline
local

Registered: 06/19/02
Posts: 248
Loc: London, Ontario
thanks for the replies, I was just always wondering why :0
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#95326 - 05/31/05 12:05 AM Re: Rubber vs Foam...
freesey Offline
local

Registered: 06/19/02
Posts: 248
Loc: London, Ontario
how do you like the F2s? I bought a pair of AS -B2's at futureshop on boxing day for 200$, they arent as great as all the people on epinions.com and audioreview.com say but they are very good for the price. Some people compared them to mission and tannoy - which I dont understand at ALL (I also disagree lol)
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