Noise Reduction - FAQs
All files and documentation are offered on an *AS IS* basis and you assume full responsibility for using them.
ANR-20 - Specifications 
- Driver Unit: 40mm 32 Ohm
- Frequency Response: 
     20Hz~20kHz (noise reduction on) 
     70Hz~20kHz (noise reduction off) 
- Sound Pressure Lever (SPL): 92 dB± 3dB 
- Noise Reduction Maximum Level: 20dB ± 3dB (Around center Frequency 200 Hz)
- Noise Reduction Active Range: 100Hz~800Hz
- Total Harmonic Distortion (THD): <1%
- Range of Operating Voltage: 2.5~3.5  Vdc
- Input jack: 3.5mm stereo
______________________________________________________________________________