Accession Number:

ADA609344

Title:

A Comparison of the Single-sided (Gen II) and Double-sided (Gen I) Combat Arms Earplugs (CAE): Acoustic Properties, Human Performance, and User Acceptance

Descriptive Note:

Final rept. 2007-2009

Corporate Author:

ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD HUMAN RESEARCH AND ENGINEERING DIRECTORATE

Report Date:

2012-12-01

Pagination or Media Count:

52.0

Abstract:

The U.S. Army Research Laboratory conducted a multi-factor assessment of the second generation Combat Arms Earplug Gen II CAE in order to determine whether it maintained the acoustic properties of the first generation CAE earplug Gen I CAE while improving its usability. Both versions of the CAE are dual mode earplugs providing either linear or nonlinear leveldependent noise attenuation. The Gen I CAE is a dual-sided earplug, with one side providing linear protection and the other providing nonlinear protection. The Gen II CAE is one-sided earplug, with mode selection accomplished by rotating a cylindrical switch in the body of the earplug. This report documents the results of steady-state and impulse noise attenuation objective and real-ear measurements localization and speech intelligibility human performance tests and user-acceptance questionnaires administered to Soldiers deployed in Iraq. The results of acoustic measurements and psychoacoustic assessments of Gen II CAE indicate that it closely matches performance of the Gen I CAE. The deployed Soldiers indicated some problems with the Gen II CAE but in general preferred the Gen II CAE over the Gen I CAE. These data and the qualitative improvements in Gen II CAE design fully justify the acquisition of the earplug by the U.S. Army.

Subject Categories:

  • Acoustics
  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE