A strong neodymium magnet and a voice coil made of copper-plated high-tech wire make this possible. The conductivity and weight of the wire are perfectly balanced. The closed-back design of the DT 700 headphones is the most sensible option as they isolate the sound on both sides strongly, this ensures that there is no crosstalk during the recordings; plus, the playback or the beat is not captured/recorded via live microphones.