Monster M550i-1M M-Series 550 RCA Stereo Cables (1 meter) (Discontinued by Manufacturer) Two Time Correct multiple-gauge wire networks provide phase compensation for more natural music. UL CL3-Rated for in-wall use. Multiple gauge high and low frequency wire networks for accurate, natural sound reproduction. PEX dielectric reduces capacitive effect of insulation for better transmission of high frequency information. MicroFiber wound bass conductor isolates high and low frequency conductors for quicker response.