Hello, I'm trying to put together a 2.1 setup for my computer. I'm looking at getting a pair of JBL lsr305 powered monitors and a JBl lsr310 powered sub. The sub has balanced 2x 3pin XLR and 2x 1/4" TRS inputs and balanced 2x 3pin XLR output. The monitors have the same inputs as the sub. I currently use a schiit SYS in reverse to switch between headphone amp and computer speakers easily, and I'd like to use it for this setup as well. The SYS only has RCA connections. I've seen RCA to 2x 3pin XLR, but reviewers said it's only for going from balanced source to unbalanced input, not the other way around. Yet I've owned a 3.5mm yes unbalanced to 2x 3pin XLR cable and went from an unbalanced source to balanced input and it worked. Does a cable to do what I want exist? I've read on forums about devices that concert from unbalanced to balanced and vice versa. However if I can just get a cable I'd rather do that being I don't think there would be a benefit actually concerting to balanced as the whole stream isn't balanced. Thanks for reading!