The full-scale reference
dBFS means decibels relative to full scale. Zero dBFS is the highest representable level in a fixed-point digital file, so normal values appear below zero. A peak at -6 dBFS is six decibels below the limit.
In practice, evaluate this parameter on the final exported file. Compare several sections, avoid conclusions from one instantaneous reading, and preserve the original source unchanged.
Why digital clipping happens
When fixed-point samples are pushed beyond the representable range, the waveform is truncated. The flattened peaks create non-musical harmonics and harsh distortion. Turning the file down later does not reconstruct the lost shape.
In practice, evaluate this parameter on the final exported file. Compare several sections, avoid conclusions from one instantaneous reading, and preserve the original source unchanged.
Sample peak and True Peak
A dBFS sample peak describes stored samples. The reconstructed waveform can exceed them, so True Peak may be higher. Near-zero masters should be checked in dBTP, especially before MP3 or AAC delivery.
In practice, evaluate this parameter on the final exported file. Compare several sections, avoid conclusions from one instantaneous reading, and preserve the original source unchanged.
Floating-point DAWs
Modern DAWs often use floating-point processing internally and can carry values above 0 dBFS without immediate clipping. The signal can still clip at converters, fixed-point plugins or export, so internal headroom does not remove the need for level control.
In practice, evaluate this parameter on the final exported file. Compare several sections, avoid conclusions from one instantaneous reading, and preserve the original source unchanged.
Healthy gain staging
Record with comfortable margin, keep buses from accidental overload, and export an unclipped file. With 24-bit recording there is no need to chase zero. Good microphone technique and low noise matter more than filling every bit.
In practice, evaluate this parameter on the final exported file. Compare several sections, avoid conclusions from one instantaneous reading, and preserve the original source unchanged.
Practical example
A vocal recorded with peaks around -12 dBFS can still have excellent quality in a 24-bit session. Raising the preamp until peaks touch zero adds risk but usually no useful detail. During mixing, plugins can increase level, so the master may clip even when every original recording was safe. Gain staging keeps each stage within a comfortable range.
Compare the source and result at matched playback loudness so a technical improvement does not hide a loss of quality.
Common mistakes and a final checklist
Do not confuse analog dBu or dBV with dBFS; they use different references. Do not assume that a floating-point meter above zero guarantees a safe export. Check the fixed-point output, converters and True Peak. Preserve margin, remove accidental overloads and avoid normalizing every intermediate file to 0 dBFS.
Keep the original file and record the settings used; this makes verification and rollback much easier.