Let's check like for like and see if it's a good match directivity wise.
From the source itself;
View attachment 128822
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Looks like around 45 degrees dispersion up to 500 hz with the sub and that doesn't match with 8351 until above 1000 hz.
So in combining those speakers you get far more energy spread into the room between 500-1000 hz than anwhere else. To me that isn't desirable.
Personally I'd aim for consistency in directivity behaviour.
So, I don't understand the extreme hype.
Note the very different scaling on those plots, it deceives the eye into seeing a big difference that isn't actually there(W371 looks more narrow due to 2X scaling). You also picked the worst 8351 orientation as well as one of the ugliest W371 modes in the PDF
. Not saying it was intentional, but it does change things.
I hadn't read this post before responding to your first post, but this is that bulge I was talking about in the vertical orientation. I definitely see what you mean here, and it's what I was trying to show in my other post. It really does seem to me that the Ones have to be laid horizontally on top of the woofer to achieve constant directivity. I wonder if Genelec talks about this anywhere? I believe I've seen them advertise it in both positions.
You really can mostly fix it by laying the speaker in the horizontal position(which controls the -3 down to below 250Hz), though it does still bulge a bit. Here is what it looks like with correct vertical scaling, crossed around 300-400Hz, and using the normal modes. By "normal" I mean horizontal 8351 + CD W371(aka kii 3 mode). The graphs you posted were vertical 8351 + a null steering mode that sacrifices some beam uniformity for the sake of fixing a room problem.
*Note horizontal scaling is off now to account for the fact that Genelec shows twice the vertical scale on the ones. The overall graph would look much better with correct horizontal scaling.
So yeah, I can get where the hype comes from. If they really do integrate as well as Genelec claims. It's kinda like a better version of the Kii 3 BXT, as the 8351b directivity is more well controlled than the Kii 3(due to point source and vertical directivity) above 500Hz. The W371 is also a more advanced version of the BXT, as it gives a few things that the Kii can't:
1. Custom crossover based on what works best for the room(I believe the BXT just compliments the 3 and spreads the bass load out?)
2. More ways to eliminate room problems. Not only does it have the cardioid mode down to 50Hz(shown above), but it also has 3 other cardioid modes that sacrificing a bit of beamwidth uniformity to fix either a side wall, ceiling, or floor reflection. Finally, it has a complimentary mode that uses both woofers(as well as the Ones woofers?) to allow the drivers to only produce those frequencies for which they aren't seeing a null.
So yeah, if it works properly, it's a better Kii 3 implementation for slightly less money. The Kii3 BXT is a SOTA speaker system, so besting it should be worthy of hype(imo). It's more of a mystery, though, until we see complete measurements. The nice thing about the Kii system is that the bass module (I think) just increases headroom and lowers distortion. It doesn't actually alter the directivity(since the Kii already has it built in).
We really need to see complete measurements, though. Maybe Genelec could send a complete system in for review?