IT-Review

Sound Isolating Earphones Outperform Noise Cancellation Models

The nearly 4 million iPods sold to date combined with the explosion of competing MP3 players, multimedia laptops, and DVD players, have created a booming portable entertainment market. Users looking to enhance their experience are turning to premium accessories like sound isolating earphones and noise-canceling headphones. Shure Personal Audio proved this point using the following noise-cancelling models: Bose Quiet Comfort 2, Sennheiser PXC-250 and Sony MDR-NC20.

Sound Isolating Earphones Outperform Noise Cancellation Models

The products were tested for their ability to reduce the noise in standardized, one-third octave test bands over a six octave range. The decibel (dB) attenuation data were obtained in an independent testing facility, the Auditory Systems Laboratory at Virginia Tech, which is under the direction of Dr. John Casali, Grado Professor. Interpretation of the results was performed by Shure. The study utilized 10 subjects certified to have normal hearing, each of whom wore several noise-reducing headphones. To ensure accuracy, each subject was tested with each product on three separate occasions, utilizing procedures standardized by the American National Standards Institute.

A recent study compared the performance of Shure sound isolating earphones against three models of noise-canceling headphones and found that the sound isolating design was more effective at reducing the level of a broadband noise signal. The tests were conducted in accordance with recognized industry standards for measuring the noise attenuation capabilities of hearing protection devices and noise-canceling headphones.

The study results revealed that the E3c with foam sleeves was the best performer among the Shure units tested, as it reduced noise by 10 - 27 decibels more than even the best-performing noise-canceling model tested. Further, the data indicated that all of the Shure model variations tested provided greater overall noise reduction at the lower frequencies where noise-canceling models are reputed to be most effective.

Shure analyzed the test data and concluded that the difference in performance between sound isolating earphones and noise-canceling headphones is even greater than previously thought.

In addition to better performance in noise reduction, Shure's E Series earphones were specifically designed to address many of the shortcomings consumers experience with noise-canceling models. Unlike bulky noise-canceling models, the E series does not require additional batteries, and the compact design of the E series makes them the perfect accessory for portable media electronics, particularly when users are traveling or on-the-go.

Source: press release

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