+4dbu is equivalent to what voltage?

In audio production, +4 dBu is a standard reference level used to denote professional audio equipment signal levels. The dBu level is a voltage level referenced against 0.775 volts RMS, which is commonly recognized in audio engineering.

To convert dBu to voltage, you can use the formula derived from the dBu definition:

Voltage (in volts) = 0.775 × 10^(dBu/20).

Applying this to +4 dBu:

1. Convert the dBu to a linear scale:

4 dBu = 0.775 volts × 10^(4/20) = 0.775 × 10^(0.2) ≈ 0.775 × 1.5849 ≈ 1.23 volts.

Therefore, the voltage corresponding to +4 dBu is approximately 1.23 volts, making it the correct choice. This knowledge is essential for audio professionals to ensure that signals are at appropriate levels for mixing, recording, or broadcasting without distortion or signal loss.