Passive Ribbon Microphone That can handle a wide range of sources including Japanese instruments DIRECT SOUND DS-R5 Review By Takayoshi...

Isolation Headphones vs Noise Canceling Headphones Noise isolation, also known as "Passive Noise Cancellation," or “Passive Isolation” is...

EX29 Isolation Headphones created in 2000

The Flagship and First Direct Sound Product EX29 Extreme Isolation Headphone