The sockets are wired together, so they go in, then out. The two disconnected wires tha5 go to the speakers go to just one of those sockets and solder to the two terminals. The one with the red stripe must go to the same terminal on BOTH speakers. I’d connect the stripe to the terminal that is the long connector. If you use the other one, it doesn’t matter as long as you do the same on both. Then, in mono, both speakers will be going in or out at the same time. Get this wrong and one sucks, the other blows and the result is terrible bass.