The stereo effect is achieved through differences in sound pressure level between two microphones.
From the en.wikipedia.org
The perception of loudness is related to both the sound pressure level and duration of a sound.
From the en.wikipedia.org
British employers with noisy premises are legally obliged to check sound levels with a sound pressure level meter.
From the newscientist.com
Without a specified reference sound pressure, a value expressed in decibels cannot represent a sound pressure level.
From the en.wikipedia.org
Although even then, an average sound pressure level is only one factor in determining which components will be perceived as quieter.
From the en.wikipedia.org
In addition to the average sound pressure level, the frequency spectrum and dynamics of the sound are important in determining if the sound of the computer is noticed.
From the en.wikipedia.org
To adequately reproduce a wide range of frequencies, most loudspeaker systems employ more than one driver, particularly for higher sound pressure level or maximum accuracy.
From the en.wikipedia.org
Subjective sleepiness was assessed using the ESS, and snoring intensity was assessed using the highest one percentile ambient sound-pressure level attained while asleep during PSG.
From the sciencedaily.com
Low impedance headphones yield a louder sound from a standard headphone jack, and require less voltage to achieve a target sound pressure level-an important consideration for portable electronics.