If you are lucky enough to acquire a working pair of Sony DR-11 headphones, you are purchasing a piece of audio history. However, they are not without their quirks. Modern functionality often requires the use of a 6.3mm to 3.5mm adapter to connect to standard smartphones, computers, and portable music players. Furthermore, finding original replacement parts, such as the proprietary leatherette ear pads, is nearly impossible.
While they are collectors' items today, understanding how they work provides insight into 1970s audio philosophy. Interestingly, the Go to product viewer dialog for this item. sony dr11 headphones
Report compiled from vintage audio forums, period catalogs, and user measurements. For purchase, check eBay, Yahoo Auctions Japan, or thrift stores. If you are lucky enough to acquire a