Impulse Assessment of the Honeywell Howard Leight (trademark) MAX (registered trademark) Earplug

Abstract

The impulse peak insertion loss (IPIL) is the standard measure of attenuation provided by hearing protection devices (HPDs) in response to an impulsive noise. This technical memorandum describes the IPIL testing conducted and the calculated mean IPIL values for the Honeywell Howard Leight MAX Earplug (Howard Leight MAX; Model: MAX-1). Testing was in accordance with the ANSI standard S12.42-2010. All samples were tested at the nominal levels of 160 and 170 decibel peak (dBP, re: 20 microPa). A total of five samples were fitted to an acoustic test fixture two times each for a total of 10 trials per test level. No samples of the HPD were rejected. The mean and standard deviation (SD) IPIL values for each nominal level were 47.9 (2.1) dB at 160 dBP and 49.1 (2.1) dB at 170 dBP (see Table 1). These results suggest that when properly fit and functional, the Howard Leight MAX will adequately protect (i.e., reduce exposure to less than 140 dBP) for impulses below 180.0 dBP.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2021
Accession Number
AD1153825

Entities

People

  • Alexa H. Kolias
  • Derek W. Schwaller
  • Jeremy S. Federman
  • Natalie Silvia
  • Stephanie J. Karch

Organizations

  • Leidos
  • Naval Submarine Medical Research Laboratory

Tags

Communities of Interest

  • Biomedical
  • Ground and Sea Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Acquisition
  • Air Compressors
  • Air Pressure
  • Attenuation
  • Biomedical Research
  • Computers
  • Data Acquisition
  • Data Analysis
  • Department Of Defense
  • Digital Filters
  • Ear
  • Filters
  • Free Field
  • Frequency
  • Governments
  • Hearing Protection
  • Impulse Noise
  • Insertion Loss
  • Microphones
  • Shock Tubes
  • Test Fixtures
  • Transfer Functions
  • United States
  • United States Government

Readers

  • Acoustics.