Here's a comparison to help you understand:
* 49dB: About the same volume as a quiet library or a refrigerator humming.
* 60dB: Normal conversation.
* 70dB: Traffic noise.
* 80dB: Alarm clock, blender.
* 90dB: Loud music, lawnmower.
* 100dB: Motorcycle, rock concert.
As you can see, 49dB is much quieter than everyday sounds. You might not even notice it unless you were in a very quiet environment.