For 1.0 W of electrical input power, a certain loudspeaker produces a sound pressure level of 92 dB at a distance of 1 m from the speaker. When sound is radiated uniformly into a hemisphere, a handy rule is that the sound power level at the source is 8 dB greater than the level at 1 m. For this speaker, the sound power level at the source LW = dB and the sound power W =
W