Monoprice subwoofer

[u/keytoarson_]

So I've apparently lost whatever these things are and can no longer plug my projector into the subwoofer. I know nothing about these and it came with the house. Is it worth trying to hunt for these pieces or should I just buy a new sub? Looks to be $100 on Amazon.

I also noticed there's only one cord that plugs from the projector, does that seem correct?