Dining room? That’s a pretty ridiculous location for a rack of audio equipment. Who’s idea was that?
Looks like you have at least 24 speakers there, that’s quite a lot. Judging from the coax cable with the RCA plug professionally taped in it looks like a number of the speakers comprise a home theater system (the RCA would be for a powered subwoofer).
Hard to get specific without knowing more, but you’re looking at, at minimum, a AV receiver with second or third zone outputs and some additional amplifiers.
Regards,
Wayne A. Pflughaupt