One watt RMS produces a 105 decibel per meter sound pressure level ( SPL ), which is approximately 14 20 decibels higher than conventional speakers.
32.
Equal-loudness contours indicate the sound pressure level ( dB SPL ), over the range of audible frequencies, that are perceived as being of equal loudness.
33.
The sound pressure level of large rocket engines has been measured at greater than 200 decibels one of the loudest man-made sounds on earth.
34.
For example, a day-time average sound pressure level of 60 decibel increasing coronary heart disease by 61 % in men and 80 % in women.
35.
In order to distinguish the different sound measures a suffix is used : A-weighted sound pressure level is written either as dB A or L A.
36.
A cone speaker's sound pressure level, on the other hand, decreases by 6 dB for each doubling of distance because it behaves as a point source.
37.
The resulting sound pressure level depends on the sensitivity of the loudspeaker and the size and acoustics of the room as well as amplifier power output.
38.
The shooter, gun crew, or close bystanders may perceive an increase in sound pressure level as well as an increase in muzzle blast and lead exposure.
39.
Each line on this graph shows the SPL required for frequencies to be perceived as equally loud, and different curves pertain to different sound pressure levels.
40.
Alternatively some programs require you to enter the number of boxes and it will predict the resulting sound pressure levels in different parts of the room.
