Residential Sound
![Residential Sound](http://www.sdmmag.com/ext/resources/Issues/2016/October/iStock_26315489_LARGE.jpg?1475259398)
What’s Wrong With This?
Wally was installing a sound system in a large room. People in the rear of the room could hardly hear what was being said. In the front of the room, just four feet from the speaker, the decibel level was 50dB. The back of the auditorium was 32 feet. What was the sound level at the back of the room?