@kenjit ,

"I dont know where you read that it absorbs most of the backwave. It does not. The absorber is only used on the tweeter. Not the woofer."


Yes, a real pity since most of the backwave is caused by the woofer.

Still, even just an ’open backed’ tweeter sounds like a great idea if KEF have actually pulled off that trick in a mostly sealed box.

So maybe existing LS50 owners (and rival manufacturers) shouldn’t panic and would be better off waiting to see if customer feedback here matches Steve Guttenberg’s enthusiasm for the KEF LS50 Meta.

@abd1 could be the first of many out of the blocks before we get to see a direct head to head comparison between old and new.

Exciting stuff nevertheless.

https://youtu.be/oKTYvP7YQ0Q
If you ever go to a KEF Blade demo, one thing they so is to put quarter on edge and balance it on top of the speaker. Then they crank some tunes real loud. The quarter does not move and stays balanced on its edge. Love the Blade.
I got a demo today and ordered a pair.  Will shootout with my current ls50s when I get them.  
I do think Guttenberg May have gotten the frequency range absorbed wrong in his video.

Still a lot of what goes into detail happens at higher frequencies (overtones) and the new technology is said to offer 90%+ absorption compared to only 60% before and the cabinets on all ls50s are very robust.

For now I will just say the demo was very impressive and leave it at that.

And, Guttenberg mentioned the internal bracing is improved in the Meta. It's going to be interesting to see if they measure differently than the original, assuming John Atkinson gets a pair (he loves the original).

I love the matte finish on the Meta, too.