I moved into a place where I had a blank cenderblock room located under my garage.
9 ft x 24 ft. I had to build some shelves for my albums I've collected over the years from being a club DJ. Then I went with a studio set up that is mostly digital stuff. And finally made some panel speaker with some inexpensive surface speakers that can turn what ever they are mounted on, into a speaker. I run those through a 4 ohm Rockville blue tube amp which is my go to system to listen to music.
I call it "Club Bluesberry" Because of the color of the walls. I have blacklights, lasers, e-lights that turn the place into a cool place to hang..