Can I use my Android phone as a USB speaker? I have a Lenovo S850 (non-rooted so far, although I've read some guides and may try it when I find the time). Is there a way to use it as a USB speaker for my PC at work, which doesn't have any speakers. I don't have a wireless network there so that is not an option.

I just want to convert my phone to a speaker with as little work as possible, i. e. plug in USB cable, turn on an app and possibly install something on my PC. Is that possible?

Edit: This could be relevant: http://www.phonearena.com/news/Android-5.0-Lollipop-supports-USB-DAC-audio-devices-we-go-ears-on_id66399
Also there are lots of USB speakers out there. So with my limited knowledge I guess something like this could be done with only the help of an app.
Even though I marked this as answered I feel I need to add that I've managed to do exactly what I wanted with SoundWire and the default internet sharing on my phone as follows:


Install and configure SoundWire on PC and phone.
Share phone's internet connection via USB.
Assuming you already had internet on your PC, you now have 2 network adapters. You need to make sure you are using your old adapter for internet access. As far as I could find to do this you need to change the metric of your default adapter to 1 so that it is the preferred adapter by Windows (Windows 7 in my case).
You can check the server IP by typing ipconfig in the command prompt.
Connect from the SoundWire app on your phone. You get a message that WiFi is disabled, but it still works fine.