The Sony MDR-A 21 L is a model of headphones produced by Sony during the late 1980s to early 1990s. It falls within a series that includes several other models, catering to different audio preferences. While specifics such as frequency response and impedance might not be detailed publicly, the MDR-A 21 L is crafted to provide a comfortable listening experience, likely featuring padded ear cups and an adjustable headband. The design reflects the aesthetic sensibilities of its era, incorporating quality materials and build typical of Sony's engineering standards of that time. It was manufactured in Japan, ensuring adherence to high production standards. The original price is estimated to be around 90 DM, indicating it was positioned as an accessible option within its category.