I started into audio back in 1979 when I built a Dynaco SCA80Q integrated amplifier. After I put it together, it didn't work. Luckily, I have friends that work on electronic equipment. After he checked it out, it turned out that a couple of parts had been put in backward, which he fixed for me... no charge. It was my first entry into surround sound and it worked for many years. I had a friend of mine that was a chemistry professor for a university. He had drawn up plans to build some speakers. It measured 36"H, 24"W, and 20"D. I can't remember the names of the tweeter and midrange, but they were great. My bass speaker was a 12" Altec Lansing raw speaker. My brother in law is a cabinet maker and he cut up a 4'x8' birch veneer plywood for the cabinets. I had a Speakerlab crossover, which I don't know if they are available anymore. It was vented and I used house insulation inside the cabinet. I took it to my friends laboratory and he tested it. That was in 1980 and it sounded great. The bass could catch the lowest pedal of an organ and if you weren't careful, would bust your eardrums. I loved to hear it with the opening of 2001, A Space Odyssey. Sad to say, I don't have room for it, so I gave it to my son. He had wanted it ever since I built it.
I bought a couple of JBL L-110 in 1980 and I had it refurb a couple of years ago. I use them for my surround L/R. I got a great deal on a couple of Klipsch Forte II speakers. There was a company that would sell items from an insurance fire sale. I got those speakers for $100. They were and are in great condition. My center speaker is an old Yamaha speaker and it really does it's job. I got a JBL 250E for $50 from the same company and it also does a great job. I bought 4 Polk In Wall speakers for my "Presence Front and Rear Channels (Like ATMOS, only sounds better. I just bought 2 Klipsch desktop speakers for my Rear Surround channels. I haven't used them yet because my theater is a mess from some of the other junk I have.
I have the Optoma UHD60 Projector. It isn't the top of the line of projectors, but the movies look great. I have a Yamaha Aventage RX-A3070 AV Receiver connected to my Yamaha Aventage RX-A3010 AV Receiver. The 3070 plays all the channels except the Front and Rear Presence Speakers which is connected to the in wall speakers. All in all, I really like my budget theater. Any good ideas you might have, I would love to hear them.