So... After several months of searching around, I finally found these. Cookie to those who (immediately) recognize what this thing is
Noo? Fair enough, let's make it somewhat easier then:
And in case you're still confused, here's the final pic - to put things in perspective:
These are official Adi-branded monitor speakers, made specifically for their MicroScan Series - models 4P (15"), 5P (17") and 6P (19"). I also picked up yet another 4P (15" MicroScan) for the same price and decided to hold onto it, Justin Case things ever go south & my primary 4P breaks down ... for whatever the reason.
What I can't seem to understand is how come nobody bothered to keep these things, making them so difficult to come by, nowdays. Because the actual CRT isn't that rare, they pop up every once in a while, but 99% of them are single unit without any additional components, making these Adi speakers incredibly difficult to find *shrug*