fun read and great pics
https://www.psaudio.com/article/what-is-a-bass-part-2-jacks-4000-revolution/ (https://www.psaudio.com/article/what-is-a-bass-part-2-jacks-4000-revolution/)
Nice pics indeed.
I like where he says about #001, "it's the greatest bass in the world. Like an extremely good upright bass, every single note in its two-octave neck swells, gets louder, when struck."