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double power
Posted: Tue Apr 10, 2007 9:07 pm
by bdubs767
what is the db rules?
I always thought it was
double your power = 3db gain = double the spl
but someone told metonight it is....
times 10 your power = 3db gain = double spl
How did I miss this all this time?
Posted: Tue Apr 10, 2007 9:54 pm
by Audiophiliac
A doubling of power = 3dB gain. Which is what is normally referred to as the minimum needed to hear an audible increase in volume, although I am sure a lot of people can hear smaller increases.
To double SPL, you need 10 times the power or 10dB increase. Every 10dB is a doubling of SPL or perceived volume. So 100dB is twice the SPL as 90dB.
There are some more scientific and quantitative descriptions available by googling
Posted: Tue Apr 10, 2007 10:11 pm
by 1moreamp
Audiophiliac is dead on correct... C
Posted: Wed Apr 11, 2007 8:15 am
by rolandk
The dB formula for power is different than dB for SPL (and voltage and current)
For watts its:
dB=10 log (P1/P2)
For SPL/volts/current its:
dB=20 log (P1/P2)
Posted: Wed Apr 11, 2007 8:22 am
by bdubs767
well I missed the bus on this one...
Errin, Fowler, and Paul time to pick me up in the short bus again....
Posted: Wed Apr 11, 2007 8:26 am
by Bfowler
we have to go back and get the special short bus with the wheelchair elevator.
Posted: Wed Apr 11, 2007 9:07 am
by 1moreamp
