PA loudspeaker Sound refers to the process of wave vibration produced in elastic media (air, water, etc.) that can cause human hearing.
Sound field refers to the spatial range of sound wave propagation.
Sound pressure is the difference between static pressure (atmospheric pressure) and pressure at a point in the sound field. The instantaneous sound pressure value refers to the sound pressure at the moment of observation.
There is also the (peak) sound pressure and the small sound pressure, which means that there is an effective (mean square) sound pressure value in a complete cycle in addition to the small instantaneous sound pressure value, respectively.
According to the standard
According to the quasi-International System of Units (CM), the unit of sound pressure is the PASCAL (Pa). One PASCAL is equal to one Newtonian force per square meter of area. The unit is centimeter
In the Miksec system (CrC, that is, CGS system), the sound pressure is expressed in terms of dyne/cm2 area (dyne/cm2); So 1 Pa=10 dynes per square centimeter.
Sound intensity, originally called sound power. The average value of the instantaneous sound energy flux density. It is the center of the transmission of sound waves per unit area of freely propagating sound energy per unit time.
The number. In the standard SI system of units, sound intensity units are expressed as power per square meter area (watts per square meter). In the centimeter-gram-second system, the unit of sound intensity is
It's erg per second cm2. The latter unit corresponds to 0.001 watts per square metre; In contrast, 1 watt/m2 =103 erg (s cm2).
If it is difficult or impossible to determine the direction of acoustic wave propagation, another field energy characteristic, the sound energy density, must be used.
Horn speaker sound energy density is the sound energy contained in a unit volume. The unit of measurement is joule/cubic meter.
Horn Loudspeaker sound power refers to the sound energy of the frit in 1 second perpendicular to the sound energy flux of a given area. The unit of measurement is watt. 1 watt =10 erg/s. Sound power is determined by sound pressure value or sound intensity value.
