Denon AVR-S670H 5.2 Ch Home Theater Receiver (2023 Model) - 8K UHD HDMI Receiver (75W X 5), Streaming, Bluetooth & Wi-Fi, Dolby TrueHD, Dolby Pro Logic II & DTS HD Surround Sound (Renewed)

Buy an AV Receiver. Used you can find one for a couple hundred. New a decent one is in the $500 ballpark, https://www.amazon.com/Denon-AVR-S670H-Theater-Receiver-Model/dp/B0D45YHCJ4 (I've seen the S770 and X1700 for even less, shop around or wait for sales). Then buy two pairs of Micca MB42 G2 bookshelf speakers at $100 a pair, and a center speaker like the Micca MB42X-C. You should have just about enough left to go to the RSL web page and spend $299 on an RSL Speedwoofer 10e subwoofer, currently discounted to that. Then some generic speaker wire, pick that up off Amazon while you're getting the Micca's.