“dBu” is a unit used to represent signal levels in audio systems.The reference point for dBu is 0.775V (RMS). This logarithmic scale unit indicates signal strength, with positive values representing levels higher than 0.775V and negative values pointing to levels below 0.775V.
“dBm” is a unit that expresses the power of a signal on a logarithmic scale, using milliwatts (mW) as the reference point. Unlike dBV, which is based on voltage, dBm pertains to power and represents the power at a specific load impedance of 600 ohms. Since dBm indicates the relative strength of a signal, it can be both positive and negative; 0dBm corresponds to 1 milliwatt. dBm is widely utilized in measuring and conveying the strength of signals in electronic equipment and communication systems
“dBV” stands for “decibel Volt”, and it is used to express voltage in dB units. dBV represents voltage using a logarithmic scale based on a reference of 1 Volt (V), and it is measured in terms of RMS (Root Mean Square).
A value of 0dBV corresponds to a reference voltage of 1 Volt. Positive dBV values indicate voltages higher than the reference, while negative dBV values denote voltages lower than the reference.