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9 comments on “ Frequencies - Bexarametric - Bexarametric Pressure LP (CD)

Mar 14,  · Lp – Logarithmic Pressure. P – Instantaneous sound pressure, in units Pa. P ref – Reference pressure level, in units Pa. The P ref usually 20× Pa. The sound pressure level always refers to a specific distance from the power source(a machine). For example, consider a pump as a Sound power source.

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