Frank Fan

I used Studio Six Digital’s Audio Tools fast Fourier transform function to test the frequency response curve of Klipsch 5.1.2 in the living room today，subwoofer is R100-SW，I hope to evaluate the position of the subwoofers placement. I tried different location, as a result, there all are a peak in the frequency about 63 Hz. Is this the so-called standing wave? Can it be improved if two 12” subwoofers installed? Thanks guys.