The Sub-Sonic II was designed specifically for powered subwoofers using pure oxygen-free copper conductors wrapped in a foam PE dielectric for solid bass delivery with natural warmth. The cable also has a very heavy braided shield, making it perfect for long runs. Optimized for low frequency signals, the Sub-Sonic II is an excellent choice when connecting the LFE output of receivers to powered subwoofers. Sub-Sonic II is made in the USA.