Do you have Bose mate? If so there's an additional connector that we have and you also need to purchase:
https://connects2.com/product/productitem/ct20ns07
Whereas the OP has the speakers included with the bottom white connector, the Bose setup has an additional white connector above and that cable I've linked will convert those speaker outputs to normal RCA outputs. I've not tested yet as I'm waiting for everything to come.