64 watts = 18.1 decibels. If by 'set' you mean you have two 64 watt speakers then they will create 36.2 decibels.
Roughly 150-160 decibels.
Approx. 130 db
Depends on the machine gun. Average somewhere around 154-160 decibels. Wear good hearing protection. That level of sound is associated with pain and hearing loss.
Depends on type of ammo, barrel length, use of a muzzzle brake, etc- but typically 140 to 170 dB. Very loud, and yes, you want to use good hearing protection when shoting it.
It depends on the load and other factors but a good measure is: 12 Gauge 28" barrel=151.50dB
The iPhone can produce a maximum of 100 to 115 decibels.
88 decibels measured at 5 meters (16 feet)
A piano can produce more than 150 decibels if you play it but if you drop it off a crane, it will make more than twice as much!
that depends on the amount of explosive used
There is a few generators that will produce less than 60 decibels. That is about the same decibels as background music. These are good to use if you live in an apartment or have very close neighbors.
At 80% load factor you can support 60 fixtures.
There is 788 decibels in a speaker