Way to send Computer audio wirelessly (wifi or bluetooth) to iOS device to be heard on its speakers? Inspired by this question over on Ask Ubuntu:
  
  A method to send Ubuntu's (16.04) audio over WiFi to iOS (10.2) device?


Is there a way to stream audio from another computer (whether it's Linux, Mac, or Windows) to an iOS device (iPhone, iPad, etc.) such that the audio can play over the iOS device?

I know there are solutions for Android or such, but was curious if there's a solution or method to do this with iOS devices.
You can buy a bluetooth to audio jack adapter:

https://www.amazon.com/Wireless-Bluetooth-Stereo-Adapter-Transmitter/dp/B00RHKYX7W

This way you should be able to use it as an amplifier using Garage Band amp on your iPhone.

It should work just like so:

https://www.youtube.com/watch?v=RkL0bIx-ESk