Measurement location is at sea level so you compute the pressure. I performed over 1000 measurement which resulted in error rate mostly below 1%. In a nutshell, the measurements show the actual sound coming out of the speaker independent of the room. Both of these factors enable testing in ordinary rooms yet results that can be more accurate than an anechoic chamber. It also measures the speaker at close distance ("near-field") which sharply reduces the impact of room noise. This is a robotic measurement system that analyzes the speaker all around and is able (using advanced mathematics and dual scan) to subtract room reflections (so where I measure it doesn't matter). Measurements that you are about to see were performed using the Klippel Near-field Scanner (NFS). So someone was thinking of longevity given that the budget did not allow magnetic mount. I did not show the grill but it has metal pins and took fair amount of energy to pull it off. Fortunately you only deal with them once.
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