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This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
 
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  Topic: Enclosure damping
dsmith

Replies: 5
Views: 4165

PostForum: KEF Speakers from the 1970s   Posted: Sun May 27, 2012 12:19 pm   Subject: Enclosure damping
Most of the pads I've seen are automotive self adhesive pads. They are intended for sticking to body panels to damp the metalic ring. The materials seem pretty standard as a generic tar substance.
...
  Topic: Thinking of Stiffening 105.1 BassEnclosure with Ceramic Tile
dsmith

Replies: 19
Views: 11467

PostForum: KEF Speakers from the 1970s   Posted: Sat May 26, 2012 11:45 am   Subject: Re: Thinking of Stiffening 105.1 BassEnclosure with Ceramic
.. hopefully resonances that do exist will be raised beyond the pass band of the bass cabinet.

Adding mass should minimise acoustic breakthrough, though I find it difficult to think that this is t ...
  Topic: Thinking of Stiffening 105.1 BassEnclosure with Ceramic Tile
dsmith

Replies: 19
Views: 11467

PostForum: KEF Speakers from the 1970s   Posted: Fri May 25, 2012 2:15 am   Subject: Thinking of Stiffening 105.1 BassEnclosure with Ceramic Tile
Hi Kimmo,

Yes, very interesting indeed. I am struck by how Harwood's findings are so at odds with perceived audiophile notions. As to the optimal stiffness of 9mm ply or otherwise, I think the ta ...
  Topic: Thinking of Stiffening 105.1 BassEnclosure with Ceramic Tile
dsmith

Replies: 19
Views: 11467

PostForum: KEF Speakers from the 1970s   Posted: Wed May 23, 2012 6:44 pm   Subject: Re: Finish Birch Plywood
In my opinion Harwoods idea to use birch plywood is based on stiffness of plywood, especially when using birch plywood made here in Finland. Young´s modulus of birch plywood is roughly 3 times higher ...
  Topic: Thinking of Stiffening 105.1 BassEnclosure with Ceramic Tile
dsmith

Replies: 19
Views: 11467

PostForum: KEF Speakers from the 1970s   Posted: Thu May 10, 2012 12:26 pm   Subject: Thinking of Stiffening 105.1 BassEnclosure with Ceramic Tile
You really should start by reading the Harwood paper on the subject.

http://www.bbc.co.uk/rd/pubs/reports/1977-03.pdf

He finds that lowering the level of cabinet resonances in the midrange is ke ...
  Topic: Model P60
dsmith

Replies: 36
Views: 27943

PostForum: KEF speakers   Posted: Wed May 09, 2012 10:59 pm   Subject: Model P60
I had forgotten about the Speakon conectors but the Ebay pictures on the last page clearly show them. This would have been a nice professional touch and may have been required by the BBC (and again, ...
  Topic: Reference 5/1AC active
dsmith

Replies: 15
Views: 6197

PostForum: KEF speakers   Posted: Wed May 09, 2012 1:45 am   Subject: Re: rectangular hole
I have been interested how much colouration is caused by rectangular hole on LS5/8 baffle, that was used to match 12" woofers directivity to to 34mm dome

Yes, an interesting question. At the t ...
  Topic: Model P60
dsmith

Replies: 36
Views: 27943

PostForum: KEF speakers   Posted: Wed May 09, 2012 1:30 am   Subject: Model P60
Is SP3071 the standard C60?

The P60 was a pro market deriviative based on the C60 cabinet and drivers. It was aimed and radio and television broadcasters along with small recording studios. The C ...
  Topic: Model P60
dsmith

Replies: 36
Views: 27943

PostForum: KEF speakers   Posted: Tue May 01, 2012 2:59 pm   Subject: Re: driver mounting

Next alternative is probably to make some kind of hook and try to pull B200 off the cab... or does anybody have better idea how to break P60 drive units loose?

Best Regards

I've had some luck ...
  Topic: Model P60
dsmith

Replies: 36
Views: 27943

PostForum: KEF speakers   Posted: Mon Apr 30, 2012 8:33 pm   Subject: Model P60


Because of the low production quantities, Production Dept wanted nothing to do with it and so Dave Smith and I ("KEF Professional Products" as we were at that time) lined all the cabinet ...
  Topic: Happy Birthday
dsmith

Replies: 14
Views: 5132

PostForum: KEF Speakers from the 1970s   Posted: Sun Oct 09, 2011 4:20 pm   Subject: Happy Birthday
I'm hoping for a gratis copy as I contributed sme material to KK. (Also to his Quad and the McIntosh book. I should get royalties!)

I was just looking at the KEF 50 years site. I love the pictur ...
  Topic: R107/2 Head Crossovers MF/HF EQ.
dsmith

Replies: 4
Views: 2670

PostForum: KEF Speakers from the 1970s   Posted: Mon Jul 18, 2011 2:36 pm   Subject: R107/2 Head Crossovers MF/HF EQ.

I can't help with the HF attenuator section except to say that if they used the scheme Dave Smith and I used for the LS3/5A redesign then you should be able to work out how to wire the taps by the s ...
  Topic: KM1
dsmith

Replies: 0
Views: 2327

PostForum: KEF Speakers from the 1970s   Posted: Sun May 09, 2010 4:34 pm   Subject: KM1
One of our long debates at Classic Speakers turned into a discussion of the KM1 (around post 163).

http://www.classicspeakerpages.net/IP.Board/index.php?showtopic=5915&st=160

Anybody run acr ...
  Topic: KEF Kube
dsmith

Replies: 10
Views: 10806

PostForum: KEF Speakers from the 1970s   Posted: Mon Mar 29, 2010 1:44 pm   Subject: KEF Kube
I see, so that helped to get a more accurate frequency response from the Fourier result?
Yes, although the impulse response looks like it is quickly over, ther is a long lasting LF ringing that may n ...
  Topic: KEF Kube
dsmith

Replies: 10
Views: 10806

PostForum: KEF Speakers from the 1970s   Posted: Sun Mar 28, 2010 1:32 pm   Subject: Re: KEF Kube

I guess bass extension is a tradeoff with efficiency so if the average program rolls off in the bass, you can boost the low bass at line level before the power amp just enough to avoid clipping or c ...
 
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