Question Help!!

I just bought a new home and had them install built in surround plus two stereo speakers. I have no idea how to connect to the panel in this picture. I bought a 4khdr receiver but don’t know what to do with this pic or how to connect.. Please help!

You also need to check what speakers were put in so you can check the power handling and ohm rating on them to match with the amp. Checking with whoever installed the speakers should be the fist step on how to use what they built.