The Sony MDR-NC500D headphones are not lacking for features. Examining the right earcup reveals several of them. Here, there's an audio input analysis key (more on this shortly), a monitor button for muting playback, and a switch for turning the headphones on, which automatically activates the noise-cancellation function, as well. These cans cannot be used without this function, which is a bit of a bummer if your battery runs out. On the plus side, the headphones include a built-in rechargeable lithium-ion battery as well as an extra cord with a battery pack that accepts two AA batteries (also included), or they can run off of AC power using the included power adapter. This and the interchangeable audio-input cables attach to two ports found on the left earcup. In addition to the battery pack cord noted above, Sony includes two standard audio cables of varying lengths for use with the headphones. There's also a very nice hard-shell case with compartments and straps for all the included accessories, as well as a quarter-inch adapter and a nifty airplane adapter with one retractable plug.
Of course, the most compelling feature found on the MDR-NC500D is the noise-cancellation function. First off, it uses what's known as feedback type noise canceling, meaning the microphone is placed near the ear rather than on the outside of the earcup (known as "feedforward"). This allows the unit to better analyze what sounds are actually coming straight at the eardrum, whereas the feedforward has to estimate what the sound will be once it reaches the ear. Thus, a feedback type can more accurately adjust to environmental noise, increasing the effectiveness of the noise cancellation. Also, you may have noticed the "digital" designation in the product name. This refers to the fact that the headphones use a digital equalizer combined with a software engine in order to cancel ambient noise and reduce stress on your ears. It also allows the headphones to react in-kind to various environments, such as an airplane, a train, or an office, which all generate different types of noise. The aforementioned audio input analysis key allows you to reanalyze your current environment for the most effective noise isolation.
All this technical stuff is great, but it's really for naught if it doesn't work in practice. Fortunately, we found that the MDR-NC500D headphones offered superior noise cancellation during testing in the office and on the bus. We were also not disappointed by the overall sound quality. Our one complaint is that bass sounded mushy at times--it was definitely present and didn't overpower the music, but it wasn't quite as tight as we expected. High-end details were clear and sparkly, with shimmery acoustic guitars and tinkling triangles. Mids were rich and buttery, and we felt enveloped by music on the whole.
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Sony MDR-NC500D Digital Noise Canceling Headphones:
