64 watts = 18.1 decibels. If by 'set' you mean you have two 64 watt speakers then they will create 36.2 decibels.
70-100 decibels
When lightning strikes, it can produce a sound of about 120 decibels.
The iPhone can produce a maximum of 100 to 115 decibels.
43db
A lightning strike can produce sound levels of up to 120 decibels.
A whistle can produce a sound ranging from 90 to 120 decibels, depending on the design and force blown into it.
Thunder can produce up to around 120 decibels close to the source. However, actual levels can vary depending on the distance from the lightning strike and atmospheric conditions.
A large cannon can produce around 175-185 decibels. This is extremely loud and can cause hearing damage if not properly protected.
That depends how close you measure to the elephants mouth. The closer - the louder! The distance is very important if you measure with a sound pressure level meter.
At 80% load factor you can support 60 fixtures.
An average microwave produces around 60-70 decibels during operation. This is similar to the noise level of a normal conversation.
20 decibels