Pipe organs are an important element of acoustic performance and usage of concert hall, considered as one of indicators of classical music hall. However, only limited numbers are installed or planned for local concert halls. Therefore, in order to investigate the influence of the pipe organ to the concert hall and compare with variable acoustic equipment, acoustic parameters were measured and evaluated in conditions without the pipe organ and after installation. Moreover, acoustic parameters according to acoustic variable equipment were measured and evaluated to figure out an impact on acoustic performance. The result indicates that differences of parameters according to the presence of the pipe organ were, 0.66 sec in reverberation time (RT), 0.1 in bass ratio (BR), 0.66 sec in early decay time(EDT), 2.18dB in clarity (C80), 0.12dB in strength(G), and 0.16 in lateral energy fraction(LFC). Differences of acoustic parameters due to acoustic variable equipment were 0.86 sec in reverberation time(RT), 0.09 in bass ratio(BR), 0.78 sec in early decay time(EDT), 0.64dB in clarity(C80) and 2.34dB in strength(G).

Abstract
1. 서 론
2. 대공연장의 제원 및 음향지수 측정
3. 파이프오르 간의 음향 환경 분석
    3.1 잔향시간(RT, Reverberation Time)
    3.2 저음비(BR, Bass Ratio)
    3.3 초기감쇠시간(EDT, Early Decay Time)
    3.4 음악명 료도 (C80, Clarity)
    3.5 음의 세기(G, Strength)
    3.6 측면반사비율(LFC, Lateral Energy Fraction)
    3.7 소 결
4. 가변음향장치의 음향 환경 영향 분석
    4.1 음향 환경 영향 분석 개요
    4.2 잔향시간(RT, Reverberation Time)
    4.3 저음비(BR, Bass Ratio)
    4.4 초기감쇠시간(EDT, Early Decay Time)
    4.5 음악명 료도(C80, Clarity)
    4.6 음의 세기(G, Strength)
    4.7 소 결
5. 결 론
Reference

• 김재호(Wonkwang University Integrated M.S & Ph.D Course) | Jae-ho Kim
• 문고리(Wonkwang University Ph.D Course) | Ko-ri Moon
• 윤지성(Wonkwang University Ph.D Course) | Ji-sung Yoon
• 김재수(Professor, Dept. of Architectural Engineering, Wonkwang University) | Jae-soo Kim Corresponding author