A four-piece pop group is rehearsing in a large room. Mary makes SIL measurements of the individual musicians separately a particular distance away from each instrument. She sets up her mikes, and measures the lead guitar at 83dB, the rhythm guitar at 91dB, the bass at 74dB, the drums at 93dB and the singer, who is also the rhythm guitarist, at 55dB. - The rhythm guitar player, John, thinks he is not loud enough, and plugs into a second amplifier, set to the same volume as his original amplifier. The bass player, Paul, gets mad and stops playing.
a) What is the total SIL is measured for the three members who are still playing?
b) Everyone in the band stops arguing. They move to a much smaller room, and play at the same levels as they were at originally. The engineer sets up at a distance four times closer than in the larger room. What is the total SIL she measures now?
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