Tributaries - 8BA - Series 8 Bi-Amp Speaker Cables (Pair) Tributaries 8BA is a high-performance Bi-Amp Speaker cable made by hand. The 8BA is designed with heavy 14AWG Long-Crystal Oxygen-Free (LC-OFC) copper conductors that are terminated with Series 8 locking banana plugs or spade lugs. The conductors have a unique individually insulated dual-gauge configuration for superior sound clarity. The 8BA is terminated with red & black Series 8 locking banana plugs or spade lugs. The wires are secured by dual screw terminals.