Bose QuietComfort 25 Manual de preguntas frecuentes - Página 2
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Bose
QuietComfort
®
Acoustic Noise Cancelling
What is TriPort
acoustic headphone
®
structure?
How is the total noise cancellation in
the QuietComfort 25 Acoustic Noise
Cancelling headphones achieved?
What is Active EQ?
What is full-spectrum noise reduction?
What is electronic noise floor?
For internal and reseller distribution only – Bose confidential
25
®
headphones
®
Proprietary TriPort acoustic headphone structure utilizes external ports to
vent the earcups and effectively enlarge the acoustic volume, without
increasing the size of the earcup. The result is better audio and active
noise reduction from a smaller, lighter, more comfortable headphone.
TriPort acoustic headphone structure is used in all of our consumer
headphones and headsets.
The QuietComfort 25 headphones utilize both active and passive noise
reduction technologies. They use a sophisticated proprietary electronics
approach to active noise reduction, placing microphones both inside
and outside the earcups. The electronics system senses the sound in
almost any environment and then measures, compares and reacts –
instant by instant – to produce an opposing cancellation signal. The
passive noise reduction is achieved by the combination of the acoustic
design and materials chosen for the earcups and cushions.
Active EQ (equalization) involves electronically tuning the frequency
response to closely match the proprietary Bose response curve for
headphone audio. The closer the frequency response comes to matching
the target curve, the more lifelike the audio performance.
Think of a piano keyboard as the full spectrum of human hearing, from the
low notes at one end, to the mid-range notes in the middle, to the high
notes at the opposite end. Through a combination of advanced active
electronics and passive attenuation, the QuietComfort 25 headphones
reduce noise across the full range of human hearing (all of the keys on the
keyboard). Other noise reduction headphones may be effective at only
some frequencies (only some of the keys on the full keyboard).
Noise floor is the electronic "hiss" that may be heard with some noise
reduction headphones. This noise can be annoying and can take away
from your listening enjoyment. The QuietComfort 25 Acoustic Noise
Cancelling headphones use sophisticated electronic circuitry to minimize
noise floor and make it virtually undetectable.
2
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CC013997 QC25 FAQ 5.6.14