This is exactly what I'm doing. AirportExpress to AUX on BS3000 which is part of my link system. Works with AirPlay to each link room, access to Spotify, TuneIn and all music stored on any computer in my network. Investment was 100 Euro. You need of course a wireless network in your home. For iPhone and iPad AirPlay is a standard feature for my PC I use AirFoil, a software that works very good and costs 25 USD.
Heinz
