Key Features: * Completely revised to reflect the research and technological advances of the last decade * New chapters on directional microphones and the latest digital signal processing strategies * Extensive coverage of all aspects of open-canal, thin-tube hearing aids * Practical tips, tables, and procedures designed to be pinned on the walls of clinics * Each cross-referenced chapter builds on the previous chapters _Hearing Aids, Second Edition_, is a book within a book: * Each chapter has a one-page synopsis that captures the key concepts of each topic * The material that students most need is contained in marked paragraphs that flow after each other to form a coherent thin book inside the larger book * Intervening additional paragraphs add satisfying depth Written, comprehensively referenced, and extensively reviewed by leaders in the field, this book is ideal as a core graduate text as well as a standard reference for clinicians.