I would like to know; Bose SoundTouch Wireless Link Adapter will it work with LIfestyle IV 48 series to connect as Bluetooth adapter, this to play music by pair with mobile through Bluetooth
That's a great question! You can indeed use the SoundTouch Wireless Link Adapter with your Lifestyle 48 IV as a Bluetooth input! You would also get access to Wi-Fi streaming through the SoundTouch app as well.
All you will need to do is connect the Wireless Link Adapter to either the optical input or one of RCA inputs on the console of your Lifestyle. I'd usually recommend using the RCA ports as shown HERE.
Let me know if you have any further questions about doing this!