Tributaries - 8SP12UL - UL Rated In-Wall Speaker Cable (Single) 8SP12 Speaker cables are engineered with a flat zip-type geometry that is UL rated jacket for installation inside the wall. The Series 8 begin with extremely high grade linear crystal copper (LC-OFC) developed specifically for audio applications. Tributaries LC-OFC is carefully drawn to produce a low crystal volume per foot resulting in less signal loss and distortion. 12AWG conductors consist of multiple solid gauges that are mathematically and tonally chosen to support low, mid and high frequencies for a natural sounding cable. Individually insulating each conductor yields zero strand interaction and better sound quality. This cable is the perfect speaker wire when installing Dolby Atmos in wall speakers because it provides superior imagery and improved musical dimension. Tributaries 8SP12 is a high-performance Siamese Speaker cable that is made by hand. The 8SP12 is designed with heavy 12AWG Long-Crystal Oxygen-Free (LC-OFC) copper conductors that are terminated with Series 8 locking banana plugs. The conductors have a unique individually insulated dual-gauge configuration for superior sound clarity.