Since B&W makes outdoor speakers, it's not surprising it has equipment to stress test gear with increased heat, humidity, and other factors. Despite being on the ocean, it even has a machine to test for saltier conditions.
Though the majority of the speakers are made from wood, the distinctive teardrop midrange enclosure on the 800 Series Diamond is a dense composite material that is incredibly heavy. The unfinished enclosures arrive at B&W, where they're sanded extensively to get a smooth surface.
One entire floor of B&W's facility is devoted to just black finishes. This is because to get a smooth, high-end, piano-black finish, the environment has to be clean, and many, many additional steps must be taken. Otherwise, the end result has a lumpy "orange peel" like finish. This is fine for many speakers, but for expensive speakers, not so much. Here, many different speakers await further fiddling.
Some of the high-end speakers get hand-wound voice coils, made in-house. Shelves around this area were stacked with what I assume was tens of thousands of dollars of copper wire, of many different thicknesses.
Here the diamond domes are mated with the many pieces needed to become actual tweeters. The end result is the long tweeter top you see sitting on the top of some B&W speakers. These are put together almost entirely by hand.
I'm not sure a machine could do a better job than this. She's assembling the cover that goes between the top of the 800 speaker cabinet and the teardrop enclosure you saw 20 slides ago. While no consumer will ever see the underside of these, as you'll see in the next side, they're immaculately put together.
In the first of two listening rooms (the other was a larger theater), I got to take a listen to a few cuts with the 800 Diamonds and some Classe electronics. Beautifully clean treble, accurate and tight bass, a big soundstage that you could still localize instruments in. Simply fantastic. These are the same speakers used at Abbey Road Studios.