Spotify - how to add 2nd pair and play music through both

[dmitrek]

I'm testing a 2nd pair of Phantoms in a 2nd room.

With Spotify, I can only select one pair to play in one of the rooms. 

Is there a way to get: 
1. The SAME music on both pairs. 
2. Control both volume independently? 

Thanks!

Sure. Open Spark, go to Rooms, drag another set of speakers to room with Spotify