15
Technical Information (ANSI S3.10-1974)
SOUND
ATTENUATION
FREQUENCY
125
250
500
1000
2000
3150
4000
6300
8000
MEAN
ATTENUATION
35.9
33.8
39.2
38.6
40
41.1
40.9
41.7
46.1
STANDARD
DEVIATION
4.9
4.2
4.5
4.0
2.5
3.7
4.0
3.3
3.0
NRR = 30
NRR = Noise Reduction Rating
Measurements were made according to American National Standards Institute
Specifications ANSI S3.10-1974.
These data were obtained through measurements made at the laboratories of
Michael and Associates, Inc., State College, PA, USA. Michael and Associates,
Inc. is accredited to test to ANSI S3. 19-1974, ANSI S12.6-2008, ANSI S12.42-
2010, EN352 parts 1-8 and AS/NZ S1270:2002 by the National Institute of
Standards and Technology (NIST) National Voluntary Laboratory Accreditaion
Program
(NVLAP).
Further information can be obtained from Westone Laboratories, 2235
Executive Circle, Colorado Springs, CO 80906
