I would like to get some answers on how I can stream music from Spotify on my iPad to my home-cinema receiver.
Exactly what hardware do I need to invest in?
Basically, play your track on Spotify, go full screen which reveals the sharing options, and from there you can pick your Airport Express which should be cabled to whatever AUX-in inputs your amp/receiver has.
The following pic' shows me doing something similar to an AppleTV (I don't own an airport express but the process is is essentially the same thing).
In fact for audio there isn't much difference between the an Apple TV and an Airport Express, and the choice of Apple TV or Airport Express is whether you want TV functions or Network functions as extra functionality over and above the audio. The only difference for audio is that the Apple TV has an optical out port (& HDMI), and the Airport Express has a 3.5mm Analogue/Optical output,
The iPhone version of Spotify doesn't have a full screen mode, but hit the