Play music on Samsung speakers with Alexa

Is there any way to play music through my samsung speakers with Alexa? I have 4 Samsung R1 speakers and 1 sound bar. All of these are showing in my ST I have the Echo Dot. Alexa has no issues controlling lights etc.

You can plug the dot into one of those speakers. That is one of the benefits of the dot - audio out

One word: Bluetooth.

But then I can only play music on that once speaker? I was really hoping to be able to say something similar to “play pandora in the dining room.” …it really seems like this is or should be possible.