What do I need to Stream online music?

It is to my ears & I listen a lot.Some people who have golden ears & multi thousand $ systems might say differently.

Sonos Connect has great user interface, and very easy to use and set up. If you use Tidal you might want to add a low cost DAC like Parasound ZDac or Peachtree Dac-Itx. For Spotify or Pandora no additional DAC needed. After that there are many ways to go, but this is a low cost, easy to use, way to start. And if you don't like it, resale on these components will get you all your money back !

Eddy,  Also check out http://www.computeraudiophile.com/ for lots of good information on all things related to streaming.
Dick

Thank you so much for the info.

I'm listening to a tablet hooked up to the aux. on my pre-amp right now. Just need a mini to dual rca cable and you're in.  There are many options to choose from depending on your equipment.