Good evening everyone, sorry to spam this review thread again but I really need a community opinion.
Attached are images made with RTA with super close field measuremnts (1cm off membrane) of the upper and lower woofer of said problematic Reference 3 Meta. Notice the spray of high frequency distortion. Now this only happens at high volumes of low sine notes the speaker shouldn't really try to reproduce. Since I got my subwoofer setup now it actually doesn't even have to reproduce those frequencies anymore.
The shipment to and back from netherlands would set me back 550 €, which is still okay since I got the speakers for 7500 € almost new. And it seems for now that KEF will PROBABLY repair it on warranty, if not goodwill.
Everything else measures perfectly fine but your see and hear the distortion spray that occurs when the lower woofer gets multiples of 31 Hz or any frequency below that. When using music and subwoofers it's below audible threshold (mine is about 40dB said the klippel test if focussing really hard) but I would always be bothered by not having it checked sooner. It's an annoying decision. Never get big heavy speakers guys, the shipping is a nightmare.