The M 90D uses a dynamic microphone element that is finely tuned to provide a rich low to mid frequency response desirable for clear and concise conversation. Utilizing a wind screen and directional microphone element, the M 90D's microphone structure is designed to concentrate voice input from the front while reducing side ambient noise. The built in Low Cut filter creates clear and crisp audio characteristics by shaping the low frequency response"> "> The M 90D uses a dynamic microphone element that is finely tuned to provide a rich low to mid frequency response desirable for clear and concise conversation. Utilizing a wind screen and directional microphone element, the M 90D's microphone structure is designed to concentrate voice input from the front while reducing side ambient noise. The built in Low Cut filter creates clear and crisp audio characteristics by shaping the low frequency response"> "> The M 90D uses a dynamic microphone element that is finely tuned to provide a rich low to mid frequency response desirable for clear and concise conversation. Utilizing a wind screen and directional microphone element, the M 90D's microphone structure is designed to concentrate voice input from the front while reducing side ambient noise. The built in Low Cut filter creates clear and crisp audio characteristics by shaping the low frequency response">