Why not just buy a pair of outdoor speakers like Focal, Yamaha, Polk, Dual.
What I do. I have Dual 3 ways on my deck by the pool. Replace them every 4 years or so. $80.00 maybe and it is just background sound for parties, not critical listening.
Bookshelf Speaker For Outdoors
I've been using a pair of Definitive Technology AW6500 speakers with an NAD C325BEE for years and want to get something significantly better. Thinking of using a nice pair of bookshelf speakers and drilling the back to wall mount them under an awning. I like the AW6500s for what they are and consider them the best you can get in a true outdoors speaker,but find them lacking in REALLY good sound. I spend a lot of time outdoors and entertain a lot with music around a fire pit. I would of course upgrade my integrated along with them. They would sit under a large awning, so not exposed to rain, but would be exposed to outdoors. Maybe a plastic cover when not being used? I use a LMS>Rpi4 picoreplayer>Musetec 005>Krell Digital Vanguard>Dynaudio Focus 360 in my main system and was thinking of LMS>RPi4 picoreplayer>Gustard X26 Pro>Class A or NAD C298>Dynaudio Evoke 20. Stream 3000+ 16/44, 24/96 flac and SACD DSF files. Thoughts on using the Evoke 20's outside and if so, being riven by NAD C298 rather than class A amp. Worried a little about the Dynaudio rear port if used outside. Don't want the speakers to become a spiders/bug nest. Open to other thoughts on speakers or just a plain old 'your crazy' will suffice. Thanks