Tributaries - CABLE-2A - Series 2 Bulk Audio Cable (100M) The Series 2 cables begin with ultra-pure oxygen free copper (OFC) developed specifically for audio applications. Conductors are solid gauge to prevent grainy distortion caused by stranded wire. Utilizing Tributaries Twin-Axial cable design with dedicated conductors of equal impedance for positive and negative signals the Series 2 cables will benefit the performance of any unbalanced analog audio system. The light weight, flat and flexible design provides ease of installation. The Series 2 audio cable is Tributaries entry level. Packed with performance, Series 2 will beat any similarly priced audio cable available.