I had a similar experience once with a quadraphonic receiver from the 70s. When I went to pick it up the shop owner gave me the schematics and said he’d never s

I had a similar experience once with a quadraphonic receiver from the 70s. When I went to pick it up the shop owner gave me the schematics and said he’d never seen anything that complex before. It was probably a dozen or more pages long. Even the AM/FM receiver dial pulley diagram was complex. I wanted to use it as a pet project but ultimately gave it away due to other priorities and lack of space. It wasn’t completely broken though! Various features just didn’t work. The whole system was insane. Each speaker cabinet had (iirc) 15” subs in it. Nowadays we have Atmos height speakers that are marketed as something completely new but these speakers had vertically oriented treble horns even back then. Modern speakers certainly have frequency response, efficiency, and compactness going for them, but to this day I’ve never heard any consumer system (I used to sell them in college) that loud. I rarely turned the volume past three (out of ten). I was only brave enough to briefly turn it up to seven once. When I did lights I’d never seen work illuminated. I felt Led Zeppelin in my chest.