SONY Noise Canceling Headphones MDR-NC500D
Here's the English translation:Used SONY noise-canceling headphones, MDR-NC500D.I believe the original retail price was around 50,000 yen.They've been stored away for a while, so the ear pads have deteriorated and are peeling due to age, but the functionality is not affected.Replacement parts can be purchased inexpensively.Here's the description from the manufacturer:Digital noise canceling reduces ambient noise by approximately 99%. Achieving precise filter characteristics not possible with analog, significantly improves the noise-canceling function. A digital equalizer realizes ideal frequency characteristics, reproducing high-quality sound in silence. Furthermore, you can control the amount of cancellation to match environmental sounds with different characteristics depending on the situation, allowing you to switch filter characteristics. This enables even more effective and precise noise canceling.*Value based on comparison between noise-canceling mode A under our company's simulated aircraft noise and when the headphones are not worn.Total noise reduction (according to our measurement method) of approximately 20dB is equivalent to a noise reduction of approximately 99% in terms of sound energy.Low-rebound (low-resilience) foam urethane is used in the cushioning material. You won't feel tired even after long hours of use. In addition, materials with exceptional sound insulation are used on the surface of the ear pads and the cushioning material to enhance the noise-canceling performance.For those who want to try noise canceling or understand the product, please consider.