B-Fi Multiroom Stereo Adapter w/Wi-Fi
 
The B-Fi is a wireless audio adapter that connects classic stereo receivers and speakers to smartphones and computers via Wifi. It is the bridge that lets you connect your modern high fidelity streaming music to your older analog or digital equipment.
 
With B-Fi:
Stream with Airplay, Spotify, TIDAL or Amazon Music players directly
Stream CD or 16 bit audio
Connects to all online streaming services and personal libraries
Allows for grouping(s) of multiple B-Fi adapters
Cast audio to one or many B-Fi units simultaneously
Utilizes a high fidelity 16 bit DAC with optical and RCA output