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"When I heard my new CD, based on an old recording by Enrico Caruso, I was very pleasantly surprised, to say the least. The awesome beauty of the legendary tenor's voice sparkled with clarity, sweetness and intensity. I am very grateful for the high quality of your service."

Reference acoustic pressure

That magnitude of a complex sound that produces a sound-level meter reading equal to the reading that results from a sound pressure of 0.0002 dyne per cm at 1 kHz. Also called reference sound level.