dBFS

A common professional target is to keep peaks in the range of -3 to -6 dBFS on the master output. The -6 dBFS end of that range is the more conservative choice and gives a limiter or downstream mastering processor more room to work without the signal ever hitting 0 dBFS and clipping. Some engineers accept peaks up to -3 dBFS when the mix will go straight to a mastering stage, but for a live DJ output feeding a venue system, the extra headroom from targeting -6 dBFS is generally the safer call.

dBFS measures instantaneous or peak signal level as a relationship to the digital ceiling and is used to check whether a signal will clip. LUFS (Loudness Units relative to Full Scale) measures the perceived loudness of audio integrated over time, which correlates better with how loud a track sounds to a listener. Streaming platforms normalize audio using LUFS targets: Spotify, YouTube, Amazon, and Tidal target approximately -14 LUFS integrated, while Apple Music uses approximately -16 LUFS. dBFS governs whether individual peaks exceed the technical ceiling.

The reference point (0 dBFS = digital ceiling) is consistent, but how meters display and average levels differs. Peak meters respond nearly instantly and show the highest sample value. VU-style or RMS meters average over a short window and will read several decibels lower than the peak for the same signal. Both are useful: peak meters prevent clipping, while averaged meters give a sense of perceived loudness.