LC-OFC, Linear Crystal Oxygen-Free Copper, is a high-quality conducting material which was originally produced by Hitachi Cable in the middle of 1980' s. Following that, "LC-OFC Quantum" was produced by applying Class 1 OFC for the material. Even though the production of the "LC-OFC Quantum" was terminated in the beginning of the 21st century despite of its popularity, many audio enthusiasts who is attracted by its sensitive and hi-speed sound response have awaited the reproduction of LC-OFC Quantum. By answering many customers' requests, we at Oyaide Electric decided to order the reproduction of the "LC-OFC Quantum" to Hitachi Cable. In the autumn of 2008, as the QAC-212R, the collaboration between Oyaide Electric and Hitachi Cable provides you the everlasting "Quantum sound".