RMS: The indication of a Performance in watts (RMS) is the official, international and only meaningful statement. RMS means Root Mean Square and is a complex measurement method that measures performance over the entire relevant range frequency range by means of a so-called Pink noise (see pink noise).
Compared to white noise (White Noise) a drop in level of 3dB/octave (see octave) upwards, which ensures that the energy content of the noise signal is constant per octave.