• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

KEF's New Tech is Real

  • Thread starter Deleted member 14468
  • Start date

Matias

Master Contributor
Forum Donor
Joined
Jan 1, 2019
Messages
5,029
Likes
10,799
Location
São Paulo, Brazil
Their AES published paper is attached.
 

Attachments

  • 20758.pdf
    1.1 MB · Views: 301

GXAlan

Major Contributor
Forum Donor
Joined
Jan 15, 2020
Messages
3,868
Likes
5,954
The Bowers and Wilkins drivers used in BMW cars (produced by Harman under license) use a variation of this.

1600815211643.png
 

restorer-john

Grand Contributor
Joined
Mar 1, 2018
Messages
12,580
Likes
38,281
Location
Gold Coast, Queensland, Australia
well im not buying into some maze resonator doing anything worthwhile

It immediately reminded me of one of those little ball bearing plastic mazes we had as kids.
 

restorer-john

Grand Contributor
Joined
Mar 1, 2018
Messages
12,580
Likes
38,281
Location
Gold Coast, Queensland, Australia
The Bowers and Wilkins drivers used in BMW cars (produced by Harman under license) use a variation of this.

It's been done for years and years. From laptop and phone speakers, to HiFi speakers. Now, they'll go on about computer optimized this and FEM that, wave some slow motion hands and dreamy looks from amazed people in a highly produced video.

All the manufacturers are all over it like a cheap suit with their own variations.

1600817220146.png
 

Matias

Master Contributor
Forum Donor
Joined
Jan 1, 2019
Messages
5,029
Likes
10,799
Location
São Paulo, Brazil
Last edited:

jhaider

Major Contributor
Forum Donor
Joined
Jun 5, 2016
Messages
2,822
Likes
4,514

bo_knows

Addicted to Fun and Learning
Joined
Aug 17, 2020
Messages
798
Likes
788
Location
Dallas, Texas USA
Hi Doug

Sure. There are some summation issues that negatively affect the direct sound, due to a suboptimal implentation of the crossover.

LS50.png

Correlates well with Amir's measurements: https://www.audiosciencereview.com/forum/index.php?threads/kef-ls50-bookshelf-speaker-review.11144/

There have been several (succesful) attempts made to improve upon the crossover, one example:

50.png


I've been unofficially told the issue has been taken care of in the newest version, fingers crossed.
Umro sam od smjeha kada sam procitao visokotonac i bas na dijagramu. ;)
 
  • Like
Reactions: Zvu

hmt

Senior Member
Joined
Apr 11, 2020
Messages
397
Likes
479
I don't think that's true at all. If you watch our video or read the article, taming resonances inside cabinets has long been a goal for many/most designers. Put drivers in a cabinet with no concern for resonances inside and see what happens to the soundwaves outside.

As Jack said in the video, usually it's with soft material, but a more targeted approach is what B&W did in the Nautilus with the tapered tubes and carried on with. It was a Laurence Dickie idea that has continued through his newer Vivid Audio speakers. The result of unchecked resonances translates into the acoustic -- and can be seen quite readily in the frequency response.

That said, KEF came up with a clever way to deal with it -- apparently VERY effectively.

Doug Schneider
SoundStage!

I don't deny this but this sounds like this Problem has never been solved without that metamaterial. Most good Speakers already deat with resonances inside their Cabinets.
 

thewas

Master Contributor
Forum Donor
Joined
Jan 15, 2020
Messages
6,747
Likes
16,186
I don't deny this but this sounds like this Problem has never been solved without that metamaterial. Most good Speakers already deat with resonances inside their Cabinets.
The usage in this case though is for dome tweeters which have their own little closed volumes behind where some used few mineral damping and others used exponential tubes like B&W, Vivid Audio and KEF in the past.
 
Top Bottom