It might be best to take the advice just above your last post. Is there anyone who can help you sort this out? The switch probably doesn’t have anything to do with the speakers or the wire, but you never know. The previous owner may have even taken the speakers out and just left the grill.
For the sake of explanation:
Each speaker uses two wires to connect to binding posts…to bind the wire to the post. There are different methods to connect wires to speakers, but they sometimes look like this behind the speaker:
The top twists up, you insert the wire, and you tighted the top to bind the wire to the post. The red is + and usually corresponds to the wire with a stripe and the black is – and usually corresponds with the wire without a stripe.
The wire then goes to the back of a receiver, with amplification, to power the speaker (speakers are usually passive). The back of one receiver looks like this, but there are many different types:
The ends of the wire coming out of the hole would connect to one of the “speaker outputs” labeled in the bottom center of the receiver in this example, depending on how you use them.
If those speakers are at the opposite side of the room to the TV they were probably intended as surround speakers in a 5.1 setup. I’m just assuming though. If so, you’d still need a 5.1 receiver, a pair of front speakers, a center speaker, and a subwoofer. Maybe you can go to an audio shop and see how all this is put together. They might have a service to sort out the wires and install everything for a small fee. If you post your city you’ll get some recommendations for places to visit.