The characteristic test define the thiele-small parameters and the speaker is modeled to linear or non-linear model by thiele-small parameters. The performance test is carried out the sound quality by feeling test(subjective test) and objective test. The feeling test has many problems in a viewpoint of reliability, repeatability and preference that are related to judge. The study on the correlation between feeling test and objective test are carried out in some researches and introduce the loudness, sharpness, roughness and fluctuation strength. In this study, the loudness characteristics, which is related to sound quality, of the woofer speaker that are fitted to the domestic vehicle is investigated by measurement

Abstract
 1. 서론
 2. 차량용 우퍼스피커의 라우드니스 특성
  2.1 라우드니스(loudness)의 정의
  2.2 실험방법
  2.3 실험결과 및 고찰
 4. 결론
 후기
 References

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