KRK KNS8400 - Manual (Page 4)

4
SAFETY LISTENING GUIDANCE
WARNING: LISTENING TO AUDIO AT EXCESSIVE VOLUMES CAN
CAUSE PERMANENT HEARING DAMAGE. USE AS LOW A VOLUME
AS POSSIBLE.
Over exposure to excessive sound levels can damage your ears resulting
in permanent noise-induced hearing loss (NIHL). Please use the following
guidelines established by the Occupational Safety Health Administration
(OSHA) on maximum time exposure to sound pressure levels before
hearing damage occurs.
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
DANGER
RISK
SAFE
170
180
190
SPL(dB) RELATIVE LEVEL RISKS/ACTIONS
RISK OF WINDOWS BREAKING JET ENGINE
(RISK OF PERMANENT HEARING DAMAGE - CONTINUOUS)
SPACE SHUTTLE LAUNCH
THEORETICAL LIMIT IN AIR
CYMBAL STRIKES / HIGH HATS
FULL SYMPHONY ORCHESTRA
JACK HAMMER AT 1m
BUSY ROAD TRAFFIC
QUIET OFFICE
QUIET RESIDENTIAL
CALM BREATHING
LEAVES RUSTLING
NORMAL OFFICE
HOME THEATRE / TV
PERSONAL AUDIO SYSTEMS
RECORDING STUDIO
87dB EXPOSURE LIMIT
85 dB UPPER EXPOSURE ACTION
80 dB LOWER EXPOSURE ACTION
140 dB PEAK EXPOSURE LIMIT
137dB PEAK UPPER EXPOSURE ACTION 137.5 dB = PAIN THRESHOLD (AVERAGE)
135 dB PEAK LOWER EXPOSURE ACTION
AUDITORY THRESHOLD
(RISK OF PERMANENT HEARING DAMAGE - PEAK)
LOUD CONCERT ROCK/ELECTRONIC
EMERGENCY SIREN
CANON FIRING
LISTENING DURATION GUIDANCE
120dB
115dB
110dB
105dB
100dB
95dB
90dB
Avoid or take reduction precautions
15 minutes
30 minutes
1 hour
2 hours
4 hours
8 hours (level dependant)