I started with 4-speaker stereo when I was in my early teens (1970)
It just grew from there, a TV and a 5.1 AVR, then 20 years ago, into a JVC projector with a 135" screen and 7.4.2 which I have now.
I have two old Velodyne 5000's and two old Klipsch 12's (down firing).
All are in corners of a 24' square(ish) room with 9 foot ceilings.
I bought a MiniDSP 2x4HD but haven't set it up yet. - Looks like lots of work.