Audio Systems: db to watts, signal gain, professional equipment

Question
Hello on equalizers does the the +12db for each band mean that adds 16milliwatts to the signal gain?

Answer
No, not necessarily.  A 3db increase is double power.  A 6db increases the power by 4 times.  So, a 12db increase in power is 16 times the power of whatever the 0db starting point was.  

If the starting point was 1 mw = 0db then you would be correct.  (This is true, mostly, in professional equipment, but only when properly calibrated).

Hope this helps.

C