Master&Dynamic MH40-W, Руководство пользователя

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MH40 Wireless Over-Ear Headphones
USER MANUAL
PREVENTION OF NOISE-INDUCED HEARING LOSS
Our ability to hear is amazing. Treat your ears like the precious tools they are,
and they will continue to provide you with exceptional data, as well as a lifetime
of incredible sonic experiences.
In general, do not listen “too loud or for too long,” and be attentive to your own
ears. Ringing, discomfort, or sensitivity to high frequencies and treble may be
a signal from your ears that you are pushing them to their limits and causing
irreparable damage.
As a general practice, find what seems to be your preferred listening level and
then adjust the volume down another 10% or more. Surprisingly, your ears will
attune to a slightly lower volume over time, and what seems quiet at first can
be perfect for longer listening periods.
NIHL is a preventable condition caused by both one-time and extended exposure
to excessive decibel (dB) levels. This harm to sensitive inner ear structures
is irreversible and people of all ages can be affected. Damage can happen in
a single event or gradually over time. One-time exposure to sounds louder
than 110 decibels and extended exposure to sounds over 85 decibels can
cause harm. Indicators of NIHL include hearing loss and tinnitus, a condition
of sensing constant ringing, buzzing or roaring. The NIDCD (National Institute
on Deafness and Other Communication Disorders) offers this simple rule of
thumb: avoid sound exposure that is “too loud, too close or too long.” Here
are some general references to sound levels that occur in everyday life:
refrigerator humming (45 dB); normal conversation (60 dB); city traffic (85
dB); motorcycles (95 dB); an MP3 player at full volume (105 dB); sirens (120
dB); firecrackers (150 dB).