Sound Attenuation of the Indoor/Outdoor Range E-A-R Plug

PDF

Authors
  1. Abel, S.M.
  2. Lam, Q.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
The real-world attenuation provided by the AOSafety Indoor/Outdoor Range E-A-R® Plug was examined. This device, currently used in military operations in several countries, is comprised of two vinyl plugs which provide conventional (“Indoor” plug), and level dependent sound reduction (the “Outdoor” plug), respectively. The effects of the user’s gender and repeated fittings were explored. Eight males and eight females were tested on two separate occasions. Unoccluded and protected hearing thresholds were measured for each of nine one-third octave noise bands cdentred at 0.125-8 kHz. Attenuation was calculated as the difference between these two measures. The Indoor plug provided 21- 40 dB of sound reduction. across the frequencies tested, closely matching the manufacturer’s specification. The Oudoor plug provided 5-22 dB of conventional attenuation, suggesting that it might serve as a safe means of both conventional and level-dependant attenuation in hearing-impaired users. No differences were found due to gender or repeated fittings.

Il y a un résumé en français ici.

Keywords
hearing protection;sound attenuation
Report Number
DRDC-TORONTO-SL-2003-063 — Scientific Literature
Date of publication
01 Jul 2004
Number of Pages
5
Reprinted from
Military Medicine, vol 169, 2004, p 551-555
DSTKIM No
CA025908
CANDIS No
523667
Format(s):
Electronic Document(PDF)

Permanent link

Document 1 of 1

Date modified: