For internal and reseller distribution only – Bose confidential.
CC011967_NRT Nautilus QA R3 3
14
Bose
®
QC
®
20 Acoustic Noise Cancelling
®
headphones
Bose
®
QC
®
20i Acoustic Noise Cancelling
®
headphones
Are the QC
®
20 and 20i Acoustic Noise
Cancelling
®
headphones appropriate for
industrial use as a hearing-protection
device?
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.
What are the noise reduction
specifications? Is there an NRR rating?
Bose Corporation does not provide a noise reduction rating (NRR) or
attenuation specification for our QC
®
headphones.
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.
OTHER ISSUES
Will the QC
®
20 and 20i Acoustic Noise
Cancelling
®
headphones help
consumers that suffer from tinnitus,
hyperacusis or autism?
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
®
20 or 20i headphones personally to see if they
experience an improvement.
Can you get a pressure sensation when
trying on noise reduction headphones?
Our QC
®
headphones, including the QC
®
20 and 20i headphones,
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.
To Next Page
Loading...
Need help?
General
