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Discussion in 'Trumpet Discussion' started by trumpet_man, Dec 23, 2009.
What's the difference?
Sound pressure can be measured directly and objectively using electro-mechanical tools. However, loudness is a pyschoacoustic phenomenon that cannot be measured directly, but rather is quantified by sampling the perceptions of large numbers of people as they listen to different sound pressures. Studies indicate that people perceive a doubling of loudness when power (sound pressure) is increased 10 times (roughly).
This is a simplified explanation but you can find more info here.
This psychoacoustic "compression" of higher volumes allows us to hear over an extraordinary range of sound pressures. Interestingly, our eyes work in similar fashion, so that we can see in near darkness as well as in light intensities greater than direct sunlight. We wouldn't be able to do this if our eye response was linear with respect to light energy.
Google "Fletcher-Munson" and you will find out!
10dB is twice as loud to the human ear. Adding 3dB needs double the power.
That means 8-9 trumpets playing the same note are twice as loud in decibels than one trumpet player.
I am convinced that is why symphony orchestras and jazz bands do not double up on players: too many dBs.
American Football teams usually have some substantial db's!
We call them Cheerleaders here in Germany!