EDITORIAL OFFICE EDITOR-IN-CHIEF Malcolm J. Crocker MANAGING EDITOR Marek Pawelczyk ASSOCIATE EDITORS Dariusz Bismor Nickolay Ivanov Zhuang Li ASSISTANT EDITOR Krzysztof Czyz Teresa Glowka EDITORIAL ASSISTANT Katherine Meersman EDITORIAL BOARD Jorge P. Arenas Valdivia, Chile Jonathan D. Blotter Provo, USA Leonid Gelman Cranfield, UK Samir Gerges Florian´ opolis, Brazil Victor T. Grinchenko Kiev, Ukraine Colin H. Hansen Adelaide, Australia Hanno Heller Braunschweig, Germany Hugh Hunt Cambridge, England Finn Jacobsen Lyngby, Denmark Dan Marghitu Auburn, USA Manohar Lal Munjal Bangalore, India David E. Newland Cambridge, England Kazuhide Ohta Fukuoka, Japan Goran Pavic Villeurbanne, France Subhash Sinha Auburn, USA International Journal of Acoustics and Vibration A quarterly publication of the International Institute of Acoustics and Vibration Volume 15, Number 4, December 2010 EDITORIAL Hearing Protector Issue of the IJAV Samir N. Y. Gerges ........................ 150 ARTICLES A Comparison Study of Foam versus Custom Silicone Earplugs Used as Part of an Intelligent Electronic Hearing Protector System Olav Kvaløy, Tone Berg and Viggo Henriksen .......... 151 Modelling Speech Intelligibility in the Noisy Workplace for Normal-hearing and Hearing-impaired Listeners Using Hearing Protectors Christian Gigu` ere, Chantal Laroche, V´ eronique Vaillancourt and Sigfrid D. Soli ........................ 156 Powered Electronic Augmentations in Hearing Protection Technology Circa 2010 including Active Noise Reduction, Electronically-Modulated Sound Transmission, and Tactical Communications Devices: Review of Design, Testing, and Research John G. Casali .......................... 168 Passive Augmentations in Hearing Protection Technology Circa 2010 including Flat-Attenuation, Passive Level-Dependent, Passive Wave Resonance, Passive Adjustable Attenuation, and Adjustable- Fit Devices: Review of Design, Testing, and Research John G. Casali .......................... 187 Intra-Subject Fit Variability for Field Microphone-In-Real-Ear Attenuation Measurement for Custom Molded Earplugs J´ er´ emie Voix and C´ ecile Le Cocq ................. 196 About the Authors ......................... 201 INFORMATION Book Reviews ............................ 204