I'm helping some friends setting up a bar/little restaurant. they have some tvs and are looking for an audio system.
The idea is that they can put on some music videos/sports and it shows up on all TVs and audio goes to their (to be bought) soundsystem.

all this has to be as cheap as possible, as we're in a low income country.
The environment is quite loud. so it needs some power.

So I think I just gonna buy a cheapish hifi-system with 4 passive speakers, connect it with their "smartest" tv (they are all off-brand) and run audio cables to the different areas and speakers.

how to synchronize the tvs I still have no idea, but it is not really a priority

So my questions

• What is something like this even called? with the keywords I tired i only find nothing or very expensive pro solutions.
• how would you resolve the video part? 3x 15m HDMI cables seem quite expensive, but might be the only solution. how do i split the signal?
• might it be better to buy active speakers and use a small mixer?

If you have experience in this I would be very happy for your advice/opinion.