Turn Any Speaker into AirPlay 2 Speaker (Belkin Soundform Connect) - YouTube
Amazon.com: Audio Pro Addon Link 1 Speaker Converter | WiFi Audio Adapter, Receiver for Speakers | Great, Makes Any Speaker Wireless, Connects Through WiFi | AirPlay,Spotify Connect Compatible : Electronics
AirPlay 2 Audio Adapter with Optical + 3.5mm
Amazon.com: Belkin SoundForm Connect AirPlay 2 Adapter & Airplay 2 Receiver - Wireless Streaming for Apple Devices to Bluetooth Speakers - Optical & 3.5mm Speaker Inputs for iPhone 15, 14, MacBook Pro, & More : Electronics