If you've ever seen a Jewish man with strings hanging out of his clothing, this is probably what you were seeing. There is no particular religious significance to the tallit (shawl) itself, other than the fact that it holds the tzitzit (fringes) on its corners.
Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).
If sensitivity is measured in the same way, using the same methodology, then we can compare different speakers and have a good understanding of the relative amount of power theyâll need to achieve a certain output level. Their output is measured in dB SPL (Sound Pressure Level).