Neumann NDH 20 Closed-Back Studio Headphone (Black)Critical Listening and Mixing. In the Studio, At Home, On the RoadWhile many competing closed back headphones are marred by nasty resonances in the midband, making it difficult to come to reliable mix decisions, the NDH 20 offers an astonishingly detailed, well balanced sound image, similar to Neumanns acclaimed studio loudspeakers. Superior sonics along with large memory foam ear pads make the NDH 20 a pleasure to wear for long periods without