In the car speaker, because the sound characteristics is changed by the space of car which mount the speaker, the speaker elements must be decide according to sound field. In this study, the mass of cone paper and damper is changed and the characteristics of the sound pressure and loudness are investigated by the experimental approach. According to the change of the speaker characteristics, the sound pressure and loudness level are changed. The effect of the con paper is larger than that of the damper in the aspect of the loudness. In the future, these data will be used to investigate the correlation between the sound quality and measurement data.

Abstract
 1. 서론
 2. 차량용 우퍼스피커의 구조
 3. 스피커의 특성변수
  3.1 선형특성
  3.2 비선형특성
 4. 스피커의 음향특성
  4.1 음압특성
  4.2 라우드니스 특성
 5. 실험결과 및 고찰
  5.1 선형특성
  5.2 비선형 특성
  5.3 음압특성
  5.4 라우드니스특성
 6. 결론
 후기
 참고문헌

• 이태근(대덕대학교 정밀기계공학과) | Tae-Keun Lee
• 김병삼(원광대학교 공과대학 기계자동차공학부) | Byoung-Sam Kim 교신저자