Mackie 402-VLZ4 オーナーマニュアル

Owner’

s Manual

Part No. SW0968  Rev. B 08/13 
©2013 LOUD Technologies Inc. All Rights Reserved.

20.  Exposure to extremely high noise levels may cause 

permanent hearing loss. Individuals vary considerably 

in susceptibility to noise-induced hearing loss, but 

nearly everyone will lose some hearing if exposed 

to sufficiently intense noise for a period of time. The 

U.S. Government’s Occupational Safety and Health 

Administration (OSHA) has specified the permissible 

noise level exposures shown in the following chart.

 

According to OSHA, any exposure in excess of these 

permissible limits could result in some hearing loss. 

To ensure against potentially dangerous exposure 

to high sound pressure levels, it is recommended 

that all persons exposed to equipment capable of 

producing high sound pressure levels use hearing 

protectors while the equipment is in operation. Ear 

plugs or protectors in the ear canals or over the ears 

must be worn when operating the equipment in order 

to prevent permanent hearing loss if exposure is in 

excess of the limits set forth here:

Duration 

Per Day 

in hours

Sound Level 

dBA, Slow 

Response

Typical Example 

8

90

Duo in small club

6

92

4

95

Subway Train

3

97

2

100

Very loud classical 

music

1.5

102

1

105

Matt screaming at 

Troy about deadlines

0.5 

110

0.25 or 

less

115

Loudest parts at a 

rock concert

Introduction ...........................................4

How To Use This Manual ........................4

Getting Started ......................................5

Things to Remember ...............................5