Tributaries - CABLE-8D - Bulk Video Cable (100m) The Series 8 begin with extremely high grade linear crystal copper (LC-OFC) that is silver plated to support higher frequency performance specifically for digital audio applications. To maintain a consistent 75-Ohm impedance, the coaxial Series 8 cable’s 18AWG silver-plated center conductor is surrounded by three perfectly concentric layers of dielectric which consist of a skin, foamed PE, and a final skin. Heavy triple shielding block noise from entering the signal path. The 8D precision engineering supports wide bandwidth applications to transmit multichannel audio accurately.