This paper applies an FXLMS Algorithm to analyze the degree of noise-reduction depending on the location of a secondary-sound source and error sensor from a 3-dimensional closed-space (anechoic room) by implementing a 125Hz labial. Based on the results, we conjugate the preliminary data in materializing active sound-insulated walls. The distance differences among 0.5m, 1.5m, 2.5m were measured in the analysis. In case of 1.5m from one of the distance difference, measured maximum of 18.3dB near 125Hz compared to other points (0.5m, 2.5m) in the aspect of active sound-insulated walls. Overall, at 80Hz~200Hz values of sound illustrated a degree of 18.2dB(A) and installing compact active sound-insulated walls illustrated maximum of 18.3dB near 125Hz. Overall 80Hz~200Hz values of sound demonstrated a diminution of noise effect of 18.2dB(A) and evaluated as the most stable distance difference.