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The Sony MDR-NC500D are the world's first headphones to have digital noise-canceling technology.

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Pros

Noise-canceling

3 agree

28 hours of battery-life

2 agree

Rechargeable

1 agrees

Decent sound quality

1 agrees

Excellent noise-canceling performance

1 agrees
  • Only 3 words are allowed.
Cons

Expensive

4 agree

Requires a battery

2 agree

Noise-cancelling can't be turned off

1 agrees
  • Only 3 words are allowed.
Edit

 

The Sony MDR-NC500D are the world's first headphones to have digital noise-canceling technology. This helps remove the background noise from planes, cars, trucks, buses, etc. while still providing a high-quality audio. Like all noise-cancelling headphones, there is a mic that samples ambient noise, which is then turned into an inverted wave that, when mixed with the audio playback, effectively cancels out the ambient noise. The difference in the case of these headphones is that the sampled ambient noise is converted and processed as a digital signal by the internal circuitry before mixed with the audio playback. It requires battery power, for which a rechargeable lithium-ion battery or the option of connecting to an external power supply that takes two regular AA batteries. The fully charged lithium-ion battery provides 16 hours, and two AA batteries used in conjunction with that provide 28 hours of battery life.

Features
  • Digital noise-canceling technology
  • 28 hours of battery life with lithium-ion and two AA batteries
  • 3 Different Noise-Canceling Modes for use in different places
  • Frequency Response : 5 - 24,000Hz 
  • Impedance : 40 ohms at 1kHz (on)
  • Sensitivity : 102dB/mW (on)
  • MSRP: $400
  • release date: March 2008
What's included
  • headphones powered by internal lithium-ion battery
  • oversized large, zip-up soft carrying case
  • detachable headphone cord
  • a power adapter
  • a 2nd power adapter powered by 2 AA batteries
  • 2 x AA batteries
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