A microphone having an open-circuit sensitivity of -60 dB referenced to 1 V is used to measure the sound level from the speaker in Prob. 11.37. Determine the voltage output from the microphone.
Prob. 11.37:
A certain loudspeaker produces a sound-pressure level of 90 dB at a distance of 1.0 m from the speaker cone for a power input to the speaker of 1 W. Calculate the ratio of total sound power to electric-power input, assuming all the sound power passes through a 1-m radius hemisphere in front of the speaker.