Thanks!
As a little update, the font 2 speakers work after I disconnected the bridges.
I am connecting the green cable with my phone, and connect it to the A1 (R/L) inputs, I guess my phone works with TRS after all.
I am guessing the green cable I had only has 2 channels or something, and the speakers work fine, but I guess I'll find that out after I got the 5.1 converter.