KEF LS50 Meta - Dr Sebastien Degraeve

Acoustic & Audio Engineering, Salford University

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This is a recording of an Acoustics Lunchtime Research Seminar given by Dr Sebastien Degraeve of KEF UK to the Salford Acoustics Group on the 10th March 2021.
It covered:
Part I: From the LS3/5A to the KEF LS50
Part II: Development of the KEF LS50 Meta
Part III: Metamaterial Absorption Technology
Speaker Biography:
Dr Sebastien Degraeve is a Senior Research & Development Engineer at GP Acoustics (UK) Ltd. Born in 1983 in France, he graduated from Le Mans University with a MSc in Acoustics in 2008. In 2013, he received his PhD on Acoustic Metamaterials. His research demonstrated that a periodic electrical boundary condition applied on a homogeneous piezoelectric rod exhibits Bragg band gaps. The full tunability of such band gaps presents many potential applications as frequency filters, especially for radio frequency telecommunications. After 4 years working as a Scientist on fluid-structure interaction models in Cambridge (UK) and gaining a strong expertise in Finite Element Analysis, he joined KEF in 2018 to fulfill his passion for loudspeaker engineering. As part of the product research and development team, his main interest is on new technologies.

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Опубликовано:

15 июл 2024

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Комментарии : 8

@Freedom89984 2 года назад

So this is the absolute hero that improved the great LS50! Well Sebastian, you did a tremendous job, as the little Kef’s are now sounding as I hoped the original would sound. You nailed it. I had the LS50 anniversary for 8 years, but I never was completely satisfied with the results. I wrote Kef a letter, but they never came back to me. The design is suberb, but I didn’t like the way the crossover was operating. especially with higher volumes the sound became to harsh and penetrating in the higher regions. In the meta’s this is much better. But the overall sound is also improved. Airier, better soundstage, better results off axis. The meta material is a great invention as it makes it possible to damp the tweeter in een relatively small cabinet. B&W uses a long tube with damping material placed on the cabinets of the Diamond 800 series. Takes a lot of space. So you did a great job. Kef made a good decision to hire you, as you are a specialist in the use of meta material as I saw on your LinkedIn page. Thanks very much!

@we8463 2 года назад

This is really great! I love to listen to real engineers explaining technology they developed, patented and tested over years of research rather than the BS from the “Hi-Fi publications and pseudoscience marketing” Thank you Dr. Degraeve.

@markkinsman5013 2 года назад

Excellent presentation.

@Audfile Год назад

I have a pair on the way. I am floored by the level of technology applied to this one speaker, I cant think of anything at this price level that is this advanced. As though Boeing or Rolls Royce were commissioned to build a loss leading desktop speaker. Even when I look over at gorgeous Focal speakers in this range, I cant help but think of how generic is their layout and driver complement, compared to this. Hats off, I can't wait to add them to my collection.

@teknolojigundemi 6 месяцев назад

Great presentation.

@IanKnight40 3 месяца назад

Excellent presentation!. Dispite all this great technology the speaker still has to be voiced. Who usually does this?. With the improved Meta technology in this speaker compared to the Q350 why is it necessary to move away from a 1st order crossover that is used with very good results inthe Q350?.