Power (Watts)/ Decibels (if the speaker is efficient)
2 Watts = 93 decibels
4 Watts = 96 decibels
8 Watts = 99 decibels
16 Watts = 102 decibels
32 Watts = 105 decibels
64 Watts = 108 decibels
128 Watts = 111 decibels
256 Watts = 114 decibels
512 Watts= 117 decibels
1024 Watts = 120 decibels
Some Volumes to Compare
10 decibels = normal human breathing
60 decibels = normal human conversation
110 decibels = power saw, car horn, shouting in ear,
120 decibels = jet aircraft close by, emergency vehicle siren,
rock concert