Shure P4R - Manual (Page 2)

2
ENGLISH
This symbol indicates that there are important operating and maintenance instructions in
the literature accompanying this unit.
WARNING!
USING THIS SYSTEM AT EXCESSIVE VOLUMES CAN CAUSE
PERMANENT HEARING DAMAGE.
USE AS LOW A VOLUME AS POSSIBLE.
In order to use this system safely, avoid prolonged listening at excessive sound pressure lev-
els. Please use the following guidelines established by the Occupational Safety Health Ad-
ministration (OSHA) on maximum time exposure to sound pressure levels before hearing
damage occurs.
90 dB SPL at 8 hours
95 dB SPL at 4 hours
100 dB SPL at 2 hours
105 dB SPL at 1 hour
110 dB SPL at
1
/
2
hour
115 dB SPL at 15 minutes
120 dB SPL - avoid or damage may occur
It is difficult to measure the exact Sound Pressure Levels (SPL) present at the eardrum in live
applications. In addition to the volume setting on the PSM, the SPL in the ear is affected by
ambient sound from floor wedges or other devices. The isolation provided by the fit of quality
earphones is also an important factor in determining the SPL in the ear.
Here are some general tips to follow in the use of this product to protect your ears
from damage:
1. Turn up the volume control only far enough to hear properly.
2. Ringing in the ears may indicate that the gain levels are too high. Try lowering the
gain levels.
3. Have your ears checked by an audiologist on a regular basis. If you experience wax
buildup in your ears, stop using the system until an audiologist has examined your ears.
4. Wipe the earphones with an antiseptic before and after use to avoid infections. Stop
using the earphones if they are causing great discomfort or infection.