A pascal (Pa) is a unit of pressure, named after Blaise Pascal (who among other things developed the barometer). This is the normal standard used these days by most manufacturers (an older standard used one pascal as 74dB SPL). That is, they are using the standard of 94dB SPL is equal to one pascal. The last bit 1 Pa = 94dB SPL is simply stating the test criteria. I think it is easier to start at the end and work backwards. Under the heading of Sensitivity it states: Let’s start by looking at a typical specification listing for a popular vocal microphone – the Shure SM58. For instance when comparing two microphones, one says it has a sensitivity of -65dBV and the other says -43dBV, which one is more sensitive? The answer is the -43dBV one. What do you understand about microphone sensitivity? Of late I have seen a number of people miss-interpret the specifications of microphones, especially when it comes to microphone sensitivity.
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