The gold jacks on the wall are F connectors. Typically these are used for cable television or possibly DirecTV connections. Especially since there are two at each location. I expect if you pull the plate off you will find that there is cable with RG6 written on the cable connected to them. If you Google for F connectors, you will see the connections on the back side as well.
The 4 wires coming out of the wall are far more interesting as those are far more likely to be the wires for the speakers that are in your ceiling. Typical wiring would be red/white/green/black, but blue for green isn't uncommon. Red (+) /Black (-) would be one speaker. White (+) /Blue (-) would be the other speaker. You should take a speaker off the ceiling to confirm not only that this is how it is wired, but the make and model of the speaker that is in the ceiling.
You can hook up any amplified stereo source to the wires. I'm not sure where you're located, as it looks like a European plate vs. a USA plate on the wall, but just having random wiring sticking out of the wall kinda sucks. Nothing is labeled or anything. I would typically come in and add a new plate with 4 binding post connections on it, and label it for left speaker/right speaker with the proper positive/negative colors of red and black.
A typical source for something like those speakers might be something like a Sonos Amp or even an old AV receiver bought online for $40 if you can find one and just plug it into the wires on the wall. You will have to extend those wires, which is fine to do with wire nuts to test things out. You can pick up a bit of speaker cable online easily enough or at your local hardware store typically.