What does 0 dBm, when referring to audio signals, mean?

When referring to audio signals, 0 dBm specifically indicates a level of decibels that is referenced to 1 milliwatt (mW) of power. This measurement is commonly used in audio and telecommunications to describe signal levels in a way that is meaningful for audio equipment and applications.

The term "decibel" itself is a logarithmic unit that helps quantify power levels; in this case, it's comparing the power of the audio signal to a standard level of 1 milliwatt. By establishing a reference point at 1 mW, it provides a convenient way for audio professionals to gauge signal strength and make effective adjustments. Hence, when audio equipment specifications or test results mention 0 dBm, those working in the field can understand it as the point where the power is exactly at 1 milliwatt. This standardized reference is important for consistency in the audio industry, ensuring compatibility and understanding across different devices and platforms.