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    September 6, 2011
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Arrive refreshed after a long flight, avoid distractions in a noisy office, or find peace & quiet in your living room…with ATH-ANC7b QuietPoint® Active Noise-Cancelling Headphones. These lightweight, compact headphones effectively reduce distracting background noise by 90% while offering the superior audio quality that has made Audio-Technica a worldwide leader in electro-acoustic technology. <br/>Ideal for use with MP3, CD, DVD & in-flight entertainment systems, ATH-ANC7b QuietPoint® closed-back headphones deliver clear, high-resolution sound, with impactful bass, a detailed midrange, extended treble and accurate imaging in an immersive soundfield. Their earcups have been redesigned for greater comfort, with generously cushioned padding and a shape that fits easily over any ear. <br/>The ATH-ANC7b QuietPoint® headphones feature large-aperture 40 mm drivers with neodymium magnet systems and extremely high 109dB sensitivity to provide generous volume levels from any music source. The headphones also work when the noise-cancelling function is turned off, and operate in passive mode without batteries. Noise-cancelling electronics are fully integrated in each earpiece, with no need for external modules.<br/>This product is available at <a href="http://storelocator.staples.com/"><b>Staples</b></a>, <a href="http://www.shopaudiotechnica.com" target="_blank"><b>shopaudiotechnica.com</b></a>, and other online retailers.<br/><a href="http://www.audio-technica.com/cms/features/b3ef06fca462fcad/index.html" target="_blank"><b>Read how Active Noise-cancelling Headphones work.</b></a>
 

How to eliminate high-pitched humming noise?

Hi, I just purchased a pair of QuietPoint Active Noise-Cancelling headphones (ATH-ANC7b). I am using them to reduce exposure to ambient noise in our very busy office, so I just have them turned on with no music playing. They cancel the noise very well, however, I am hearing a constant high-pitched humming noise from the left earpiece. There is occasional noise from the right earpiece, but not as constant (perhaps every 10 or 15 seconds). I am disappointed that noise-cancelling headphones introduce an annoying noise of their own - is this normal? Is there a way to eliminate this?
2 years, 11 months ago
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Cats
Boston, MA
 
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