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"Thank you and your employees for an excellent transcription and restoration. As this was my mom's piano performance on a 78, it is priceless to my brother and the rest of my extended family. As an electronics technician with my own business, I am glad that I trusted the restoration to professionals such as yourself and your workers. I thank you ..."

Pressure, sound

The acoustic pressure of a sound wave. The sound pressure at the threshold of hearing is 2 x 10-5 newtons/m2