Built in speakers - need help

[panewebie]

I am asking for help. I don't understand this stuff and am hopeful someone is able to offer advice.

I recently purchased a condo. The previous owners described how every room of the house is wired for audio. And, yes, I see built in speakers in every room. But, during the 12 years they lived there they never used them. I presume this is the access panel (shown below) but none of my cords/cable seem to fit into the red/black holes. What type of connector is this? How do I get music to play through the built in speakers? What sort of equipment do I need? Thank you for the help, and please excuse my ignorance.