Hi, i just bought a zapco c2k 2.0 amp and i see that it doesnt use RCA cable. So can i use a Zapco SLDIN-T. wire to wire it to my HU, or do i need SymbiLink unit inorder to make it work. i am trying to power a sub. what are those SymbiLink unit for? is it better if i get those too, because i see it pretty cheap on ebay. THanks