How to use an iPhone as a bluetooth (or wired) audio receiver? (Compatible with Game Consoles)?

The display in my room doesn't have speakers, but I can't buy any because I need to keep it minimalist. Do any of you have the technological genius to make this work? (Preferably not Jailbroken) (wired is okay too)

Not possible

It is only possible with a jailbreak and it most likely won't work with consoles either

You can't, you can use the iPhone to connect to wireless speakers but not to serve as a speaker for a wireless source!