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90
1,000 KHz = 1 MHz
70 dB is 10 times louder than 60 dB.
A 10 dB sound pressure level (SPL) is 0.000063 pascal and 100 dB is 2 pascal. Loudness is a problematic psycho acoustic feeling. I don't know what three times louder really means.
400-470 mhz = -70