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Offline en1omb  
#1 Posted : 01 September 2020 09:21:14(UTC)
en1omb


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This is an interesting development:

https://darko.audio/2020...l-absorption-technology/

Kef going with high-science to reduce the influence of the rear wave on their drivers. Intrigued to hear what the results are!

Are we going to get a supercharged LS50?
Offline Martin Colloms  
#2 Posted : 04 September 2020 08:36:23(UTC)
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I wonder what the absorption frequency range is ?
Offline jostber  
#3 Posted : 17 September 2020 01:09:28(UTC)
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In a white paper released by the Audio Engineering Society in June 2020, a study was conducted testing KEF's use of Metamaterial Absorber for loudspeaker enclosures.

http://www.aes.org/e-lib...d.cfm/20758.pdf?ID=20758

Edited by user 17 September 2020 01:12:52(UTC)  | Reason: Not specified

Offline en1omb  
#4 Posted : 17 September 2020 10:10:05(UTC)
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Thanks for finding that. Will give it a proper read but did see that the conclusion shows it works from 620Hz up, equivalent to a 0.5m exponential tube.
Offline en1omb  
#5 Posted : 24 September 2020 13:34:41(UTC)
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And now it has made it in to an updated LS50 and LS50 Wireless
https://uk.kef.com/pages/ls50-meta

Edited by user 24 September 2020 13:35:18(UTC)  | Reason: Not specified

Offline Martin Colloms  
#6 Posted : 28 September 2020 15:38:29(UTC)
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Technology report in preparation for the coming issue Sept - Dec 2020

Better than 99% absorption in the working frequency range!

Martin Colloms
Offline Simon Briggs  
#7 Posted : 01 October 2020 10:39:56(UTC)
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Originally Posted by: Martin Colloms Go to Quoted Post
Technology report in preparation for the coming issue Sept - Dec 2020

Better than 99% absorption in the working frequency range!

Martin Colloms


Wonder if the material will be available for those interested in fitment?
Offline en1omb  
#8 Posted : 01 October 2020 18:46:11(UTC)
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Having read the white paper and listened to the Darko podcast with the Kef R&D head, there was clearly a lot of customisation required to the tweeter to make it work. Unfortunately it is not just something that you can throw in the back of a speaker for miracle results, it has to be carefully integrated with the drivers. Old methods still apply to the diy crowd.
Offline Simon Briggs  
#9 Posted : 02 October 2020 09:14:47(UTC)
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Originally Posted by: en1omb Go to Quoted Post
Having read the white paper and listened to the Darko podcast with the Kef R&D head, there was clearly a lot of customisation required to the tweeter to make it work. Unfortunately it is not just something that you can throw in the back of a speaker for miracle results, it has to be carefully integrated with the drivers. Old methods still apply to the diy crowd.


Indeed, not something I would be interested in using personally at this stage, but wonder if trickle down tech will be available for those who are interested?

The engineering needed to incorporate the tech properly is a little beyond mere DIY at the present time, but I remain interested from an academic research and subjective sound quality impact point of view.

Edited by user 02 October 2020 09:18:07(UTC)  | Reason: Not specified

Offline Simon Briggs  
#10 Posted : 02 October 2020 09:27:33(UTC)
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For those interested here is a link to the paper, note the reference to the original KEF Carlton and the dome type 6432 midrange driver from
1967. This is a loudspeaker I still use and reviewed, published in HiFi Critic magazine July-Sept 2016

https://www.aes.org/tmpF.../elib/20201002/20758.pdf

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