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CC013997 QC25 FAQ 5.6.14

Bose

QuietComfort

Acoustic Noise Cancelling

headphones

Why do QuietComfort

25 Acoustic

Noise Cancelling headphones use

digital technology?

We make conscious decisions about which technology is used in each of

our products. In order to create a small-sized, around-ear Acoustic Noise

Cancelling headphone with Bose noise reduction, we used an advanced

digital electronic chip. It allows the circuit board to be much smaller,

because we are able to use fewer electronic components than before.

To reduce noise cancellation to a single digital chip, the analog outputs

of the microphones must be converted into digital signals. In the past,

converting these signals with the precision needed for high fidelity and

low noise floor added delay, which compromised performance by

slowing the ability to quickly react to noise. The technology in the QC

headphones reduces this delay to negligible levels, allowing for our best

noise reduction performance from an around-ear headphone.

GENERAL PRODUCT INFORMATION

What are the QuietComfort 25 Acoustic

Noise Cancelling headphones?

The Bose QuietComfort 25 headphones are our best-performing

headphones for the customer who prefers an around-ear style. They

deliver our industry-leading audio performance and noise reduction that

allows users to hear more of their music and movies – while traveling, at

the office or at home.

How much noise do the QuietComfort 25

Acoustic Noise Cancelling headphones

cancel?

It is difficult to establish one number that is valid for all the different

environments and situations where the headphones can be used. The

headphones will reduce unwanted noise to a level that is noticeably more

comfortable when compared to the same situation without using the

headphones. We encourage consumers to try it for themselves in a variety

of situations, both with and without an external audio source.

How do you compare to headphones

that say they can cancel 99% of noise?

The QuietComfort 25 Acoustic Noise Cancelling headphones compare

very favorably to other noise reduction headphones. Bose doesn’t make

claims about percentage reduction because a single number can’t tell

you much about what you will hear when you use the product. Does the

product reduce 99% of the noise at one frequency or across a wide range

of frequencies? How is the measurement done – to reflect the way

people hear different sound levels and frequencies? All of these questions

must be asked before any such claim is meaningful.

A better way to compare noise reduction headphones is with your ears.

Many Bose retail outlets provide an opportunity to listen to the product.

Bose also offers a 30-day trial, so you can see how the product performs in

real life. When you do, we believe you will appreciate the Bose difference

resulting from proprietary technology and expertise developed over three

decades of research.

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