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Acoustic performance in classroom is important especially in speech communication. In order to make learning process more effective, the acoustic quality must be considered. There are two factor considered in this experiments that is frequency and air conditioner condition. Design of experiment is a systematic method used in this experiments to describe or explain the variation of information that are hypothesized to reflect the variation. General factorial design was used to determine all possible effect for factor combination. This paper propose to analyze how to know the significant effect from factors influence the intensity level. ANOVA was introduced to analyze significant factors and the interaction both factors. Analyze was completed with 5% significance level and the results show that frequency is the most significance factor that influence sound intensity level. Air Conditioner is other effect that increase sound intensity level since the additional ambient noise. Sound factors indirectly affect a person-s comfort in activities. Related to speech communication when the lecturer want to give clear information in classroom then should speak more louder than usual. The more participants in the room will have an impact on one-s performance in carrying out their activities.