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Hagedorn Introductory Contributor
Joined: 07 May 2014 Posts: 4 Location: Denmark
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Posted: Mon May 12, 2014 10:39 am Post subject: 105/3 damping material |
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When renovating my 105/3's i found a lot of damping material inside both the closed Bass cavaties.
Besides the "wall" matts of heavy glued foam to the cabinet, there was also a layered matte of white cotton like filling in both..
The question is wether this is original or added later?
The speakers have been repaired before by the privious owner..
Best regards
Thomas _________________ Best Regards
Thomas Hagedorn |
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speakerguru Über Contributor 1000+
Joined: 18 Nov 2005 Posts: 1192 Location: Green Hut, Tovil
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Posted: Wed May 14, 2014 7:58 am Post subject: |
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I don't remember KEF ever using BAF wadding ("white cotton like filling") in bass cabinets. They used pre-cut blocks of acoustic foam for ease of fitting in production.
BAF wadding was used, in production, inside the steel MF compartments of some models. |
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Hagedorn Introductory Contributor
Joined: 07 May 2014 Posts: 4 Location: Denmark
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Posted: Wed May 14, 2014 8:30 am Post subject: |
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Hmm... I found this for a 104/2 and it looks similar
_________________ Best Regards
Thomas Hagedorn |
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MartinW Junior Contributor 20+
Joined: 12 Jun 2011 Posts: 24
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Posted: Wed May 14, 2014 8:15 pm Post subject: |
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Hey, that's my 104/2
I don't think mine had been touched before I bought them, so would suspect the wadding is original.
Regards,
Martin |
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speakerguru Über Contributor 1000+
Joined: 18 Nov 2005 Posts: 1192 Location: Green Hut, Tovil
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Posted: Thu May 15, 2014 9:07 am Post subject: |
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MartinW wrote: | Hey, that's my 104/2
I don't think mine had been touched before I bought them, so would suspect the wadding is original.
Regards,
Martin |
Fair enough; my memory is far from perfect. However mixing foam and wadding in one model, viz 105|3? I don't think so.
I did all the initial experimental work on the coupled cavity for the Fincham AES paper, which describes the effect of constraining BAF wadding, so, I'm pretty sure I would have been involved in any decision to use mixed linings. |
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MartinW Junior Contributor 20+
Joined: 12 Jun 2011 Posts: 24
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Posted: Thu May 15, 2014 10:25 am Post subject: |
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Hi guru,
Maybe my 1994 vintage 104/2s weren't as untouched as I thought then, as there is a mix of foam and wadding e.g. in the lower enclosure it's foam around the sides and the wadding at the bottom as you can see in the pic.
I think that the chap I bought them from had them from new - he didn't seem the 'tweaker' type and nothing was mentioned when I was asking him about their condition and history. It's possible that something wasn't mentioned of course...
Regards,
Martin |
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Hagedorn Introductory Contributor
Joined: 07 May 2014 Posts: 4 Location: Denmark
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Posted: Thu May 22, 2014 2:25 pm Post subject: Would wadding in this way make sense |
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Thanks guys. i have been thinking about the use of wadding material in the top enclosure does seem like a bad idea as there is nothing in the way for it to fall into the membrane over time.. gravity alone can do this
_________________ Best Regards
Thomas Hagedorn |
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steve59 Junior Contributor 10+
Joined: 14 Mar 2015 Posts: 17 Location: chicago il
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Posted: Sun Mar 15, 2015 1:10 am Post subject: first post |
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I can say with some confidence the white wadding is inside the top sealed and bottom sealed enclosure while the shared ported area has only the acoustic foam attached to the cabinet walls. |
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clubsport911 Senior Contributor 100+
Joined: 26 Aug 2012 Posts: 165 Location: Cheltenham, UK
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Posted: Thu Mar 19, 2015 10:56 pm Post subject: |
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The BAF wadding in the sealed section if standard. In the 104/2's the cavity is lined with a thick foam on the side walls and in some models (?) the force cancelling rods are surrounded by discs between the units.
The 105/3's are the same except, the force cancelling rod is bare.
Also, for some reason, the foam is different on the 105/3.. It's a much harder outer layer and definitely denser in construction.
Rgds |
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