iPhone as 'headphones' for computer I have been using headphones with an external USB sound card, but the sound card broke today, and my other audio ports are messed up.

I have an iPhone, and I know that a computer with a wireless card can stream it's audio to an iPhone, but can a computer without a wireless card (on an ethernet connection) use this or a similar service to send audio to an iPhone? Maybe even a tethered iPhone, because I can do that.
maybe look into airfoil and its iOS companion app?