Different systems playing same music simultaneously


I have four different systems located in different rooms.
Is there a way to make them play the same music like a multi-room system?
Could I send the signal from one source to all the systems at the same time?
Each system has its own amplifier and speakers.
Is bluetooth an option? Can I use a transmitter and several receivers?
Does anyone have this kind of setup?
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Guys we sell the Blue Sound products which are fantastic, however, only Roon gives you the ability to talk to many different devices,  so through Roon you can talk to Sonos, Google Chromecasts, Naim Muso, Naim  Uniti products, Auralic, and many, many others.

Blue Sound's Node is a very good $550 streamer, however, a high end Roon server coupled to a good Dac will sound even better.


Dave and Troy
Audio Doctor NJ
I am using a Dayton Audio wave link 2.4 GHz wireless transmitter/receiver to send signals from my music room to a second system in my kitchen.  Bought from Parts Express.  Cost about $60.00.  Works great but there are certain limitations.  You'll need an output from the preamp and assuming you are sending an output to your amp you'll need a second pre output.  Tape out could work or maybe headphone out.  Transmitter and receiver work best with line of sight between the two.  Call Parts Express with your questions.  

Rayd
This is pretty easy with Chromecast groups. The Creation 5 control point also does it with diverse renderers, but Chromecast is much more reliable. 
I like that this was brought up . I’m sure many of us have a,b and c systems around the house .be nice to have set up when your busy around home going from space to space. Make leaving the sweet spot more tolerable. I’ve been meaning to pick ip a second one . Likely the new version so the wife can play apple stuff when I’m not around. Then and only then . 
I currently do this throughout my house across 4 different systems. One is my main home theater system, the other a vintage console stereo, the next a Fisher 400, and finally a set of computer speakers. I do it 2 different ways. The first is I have Google Chromecast Audio devices on each of them. They are no longer made, but, you can get them on eBay. They work great and use analog 3.5mm stereo jacks that you just put a 3.5-RCA splitter on. They’re wireless so zero cabling. To sync them up you simple create a “group” that includes all the devices you want synced up and name that group. Mine is called “the house”. The you choose whichever music streaming service you want as your default and simple say, “Hey Google, play Miles Davis in The House”. Then it streams in sync to each system wirelessly. In a separate input I do the exact same thing with Apple Airport Express’. They are also no longer made, but, again eBay. I do the same thing with those for my downloaded music on my computer. I just select all the devices from my MacBook in the audio drop down menu when Apple Music app is launched. Hope that helps a little.