In order to obtain some further measure of the acoustic properties of a rectangular room, a brief subjective study is made of listener response to sounds having various degrees of modulation on their decay curves and to alternate sounds which differ only in the phase relation of a harmonic in the source with respect to the fundamental frequency. The data show that the average listener finds the decay of sounds pleasant in inverse proportion to the amount of modulation on the decay curves, and that a large majority of listeners cannot distinguish between two steady‐state sounds, alike except that in one sound the phase of a harmonic is changed with respect to that of the fundamental frequency. Also, an objective study is made of the modulation on decay curves. A switching device is used to insure a smooth cutoff at any predetermined phase of the fundamental frequency. The data show that, if the source includes the fundamental frequency and a harmonic at equal amplitudes, the modulation of the decay curve consists of two superposed modulations. The phase relations and amplitudes of these modulations are dependent on the phase relations and amplitudes of the driving frequencies which produce them.