DH Labs designed the Sub-Sonic II specifically for powered subwoofers. Optimized for low frequency signals, the Sub-Sonic II is an excellent choice when connecting the LFE output of receivers to powered subwoofers. Like all DH Labs cables, it is made in the USA. Center conductor is ofc copper, dielectric is foam PE, and the cable has a very heavy braided shield, making it perfect for long runs. Easy to terminate and highly flexible.