Thanks Pete, always enjoy reading your posts.
My brother has outdoor speakers that have held up extremely well and they’re 25 feet from the Florida Intercoastal waterway. I believe they’re Klipsch’s. The cabinet is a dense plastic material and the grills are either plastic or vinyl (PVC). I believe the speaker material is polypropylene commonly used for marine speakers. If the Klipsch’s were active and had Bluetooth, my search would be over.