Bose QC 20 ВОПРОСЫ И ОТВЕТЫ - Страница 14

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Bose

Are the QC

20 and 20i Acoustic Noise

Cancelling

headphones appropriate for

industrial use as a hearing-protection

device?

What are the noise reduction

specifications? Is there an NRR rating?

OTHER ISSUES

Will the QC

20 and 20i Acoustic Noise

Cancelling

headphones help

consumers that suffer from tinnitus,

hyperacusis or autism?

Can you get a pressure sensation when

trying on noise reduction headphones?

For internal and reseller distribution only – Bose confidential.

Acoustic Noise Cancelling

20i

Acoustic Noise Cancelling

No. These headphones were not designed for use in industrial situations

requiring hearing protection. Tests that should be performed on such a

product, such as making sure the product is not damaged by chemicals

or solvents, have not been done. The audio cable could become

tangled in machinery, posing a safety hazard. Finally, the noise reduction

rating (NRR) as defined by the government cannot be measured for this

product because the test method specified by law is generally

recognized to be inaccurate when applied to active devices.

Bose Corporation does not provide a noise reduction rating (NRR) or

attenuation specification for our QC

The 1970s-era NRR standard for rating industrial hearing-protection

devices was developed long before active noise reduction headphones

were commercially available. In fact, NRR, as defined by the

government, cannot be determined for this product because the test

method specified by law is generally recognized to be inaccurate when

applied to active devices.

Bose Corporation does not make any claims about relief of tinnitus,

hyperacusis or autism, and we have not conducted any long-term

clinical studies of the headphones' effect on these conditions. Tinnitus,

hyperacusis and autism are complex conditions that are not easily

addressed. Some consumers have reported that the headphones

improve their situation, but others have not experienced any

improvement.

With the Bose Corporation 30-day, risk-free trial period, we can suggest

consumers try the QC

experience an improvement.

Our QC

cannot create any static pressure in the earbud. We infrequently receive

reports from people who believe they are feeling such pressure. The only

explanation we have is that the perceived sonic effect one hears when

wearing any well-performing ANR headphone – where the low-

frequency sound in one's environment is significantly reduced – also can

be caused when one's eardrums are under a pressure difference, which

can happen in a fast-moving elevator or a descending airplane. Some

people may associate this sound with a sense of pressure.

headphones

20 or 20i headphones personally to see if they

headphones, including the QC

headphones.

20 and 20i headphones,

CC011967_NRT Nautilus QA R3 3