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Old 6th November 2002, 12:16 AM   #1
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Default Damar or C37 on Fostex drivers ???

Has anyone treated a FE108S or other Fostex driver?
What difference in sound can I expect from this?
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Old 6th November 2002, 12:29 AM   #2
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Default FOSTEX

Hi,

I hear about Japanese people treating their speakers with saps.
I'm aware of C37 but what is Damar?
What you can expect from it is a more homogneous sound since you are basically shifting resonances.
I wouldn't consider this a cure all though.

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Old 6th November 2002, 07:52 AM   #3
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Default Re: Damar or C37 on Fostex drivers ???

Quote:
Originally posted by bbaker6212
Has anyone treated a FE108S or other Fostex driver?
What difference in sound can I expect from this?
This is a good question for the guys on the Full Range Forum

I'd love to try it (anyone like to donate some FE108s?). ChrisB and i have puzzlecoated some FE103As with good results (damps the cone and reduces reflections back thru the cone from inside the cabinet). We didn't have as good luck with dammar, but there were extenuating circumstances.

Frank -- dammar is an artist's resin/varnish.

dave
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Old 6th November 2002, 10:33 AM   #4
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I've tried painting latex (goes on white, dries clear) onto cheap mid cones and gotten good results.
I also have put multiple coats of white PVA wood glue onto a 10" used in a guitar amp and gotten really good result too.

Eric.
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Old 6th November 2002, 10:35 AM   #5
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Default CONE COATING

Hi,

Back in the mid eighties I remember when I was at the SD Acoustics factory after the Penta Show in London.
To kill off too much time on our hands Steen asked me to lend a hand coating a few speakerunits for him.
He handed over a jar with a white woodglue lookalike compound and a painting brush.

He had made something like a potters wheel with a metal topplate so you could spin that iso moving yourself around the speaker.

All went well at first but after a couple of speakers the brush must have caught too much compound.
When I'd finished I realized I'd overdone that speaker and brought it to Steens' attention.

He came over,had a look at my lousy paintjob, sighed and in his typical manner said:"Well if you can mock up another one like that I can at least send a set off to Taiwan,can't I?

That left me both ashamed and speechless.

Anyway the compound used was sourced from Dunlop (the tire company) and was based on butyl.
When exposed to air the white colour turns to black.
Steen applied this to woofers and to the big Audax mid he was using for the SD1.
It helped to reduce cone break-up and slightly reduced effeciency due to the extra weight.
The set I had mocked must have lost quite a bit more efficiency though.

Comparing them for sound differences I can only confirm that the dif was not subtle,the treated cones sounded much more even and better behaved.

I found a source for that but there must be several others in the speakerkit business selling similar treatment products.
Just don't overdo it as I did.

http://www.lordadhesives.com/loudspe...prene_news.asp



Cheers,
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Old 6th November 2002, 11:46 AM   #6
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Default Confessions of a Former Driver Hack ... :D

Thanks Frank, good info.

Anybody know the source of the clear coating that remains slightly tacky (even after 25 years) like used on old KEF mid drivers ?.

Eric.
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Old 6th November 2002, 12:14 PM   #7
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Default THE ONE THAT NEVER CURES?

Hi,

Quote:
Anybody know the source of the clear coating that remains slightly tacky (even after 25 years) like used on old KEF mid drivers ?.
Think that was a bextrene based coating probably also sourced from Dunlop.

Sure you want that Eric?
Notorious for collecting all kind of dust particles,you know.

Cheers,
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Old 6th November 2002, 01:14 PM   #8
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Default Notorious for collecting all kind of dust particles,you know.

Yeah I know - just keep feather dusters and children's fingers away.
But it does seem to sound quite good though.
It is good for glueing new surrounds too.

Eric.
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Old 6th November 2002, 01:55 PM   #9
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Default ASK JEEVES

Hi,

Quote:
Anybody know the source of the clear coating that remains slightly tacky (even after 25 years) like used on old KEF mid drivers ?.
The magic stuff KEF used was called PLASTIFLEX

This is a Canadian company and you can pay them a visit at:

www.plastiflex.com/

Happy hunting,
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Old 6th November 2002, 02:08 PM   #10
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Thanks.
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