On a dBFS meter, 0 dBFS is the sample ceiling and normal levels are shown as negative numbers. A peak at −12 dBFS is lower than −3 dBFS. dBFS does not directly tell you perceived loudness or analog voltage.
How to read the scale
The reference point is full scale: the largest sample value the digital system can represent. Sample peaks above that ceiling cannot be stored without clipping in a fixed-point output. Floating-point DAW paths may preserve over-level signals internally, but converters, fixed-point files, and some processors still have practical limits.
Peak dBFS and LUFS answer different questions. Peak meters help prevent overload; loudness meters describe energy over time. A waveform can have high peaks and modest loudness, or controlled peaks and high average loudness.
Recording with useful margin
There is no need to force every 24-bit recording near 0 dBFS. Leave enough margin for a performer to get louder. If the source is noisy at a conservative digital level, improve the source-to-noise ratio at the microphone, room, cable, or preamp rather than sacrificing headroom.
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