I have a 7.2.4 theater in a separate building than our home. My wife says she can still hear the sound which is 20 feet away from our home. I have a Yamaha Aventage RX-A3070 AVR boosted with my older Yamaha Aventage RX-A3010 AVR to add 2 additional speakers. My speakers are a mix of older but terrific units. I have a Yamaha Center speaker, 2 Klipsch Forte II from way back-reconditioned front speakers, 2 JBL L-110 studio speakers, bought new in 1980..also reconditioned, surround speakers, 2 Klipsch R-51M (brand new for Black Friday) for the Surround Rear Speakers, a JBL E250P from SW, a Polk something for the rear SW and finally, 4 Polk In Wall speakers for the front and rear Presence, which sound great with Dolby Atmos and DTS:X movies.
That said, I did this all by my lonesome and need recommendations on the best way to arrange speakers. I have the Optoma UHD60 4K UHD home projector with a pull down screen.
Anyway, I look forward to reading how you folks handle your theaters.