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To be very precise, 0.775 V is approximately equivalent to 1mW in 600 ohms, which is sqrt(600x0.001) = 0.774596... That is the explanation of the voltage value.

John Woodgate:

>dBu? is decibels referred to 0.775 V, which is 1 mW in 600 ohms.
0 dBU is not 1mW in 600 ohms.

0 dBU is 0,775 V irrespective of impedance.

0 dBm is 1 mW in 600 ohms.

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Goran Finnberg
The Mastering Room AB
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Sweden

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