2.1.10. Source range

The source range selects the analyzed source loudness window mapped into the target range. The optimizer follows this mapping with the configured attack/release and/or linear attack/release settings.

Choose the lower and upper percentiles before optimization. The default range and the LRA preset span the 10th to 95th percentiles used by LRA.

Levels above the selected source maximum receive the gain offset at the upper boundary of the mapping. For example, mapping a source maximum of -18 LUFS to a target maximum of -16 LUFS requests +2 dB for louder sections too, before attack/release smoothing and limiting. Levels below the selected source minimum follow the low-level type setting.

The target range applies to this selected percentile window. Choosing a window focused on quieter buckets can raise the complete file’s Integrated LUFS above the target range center. Use export compensation when you want a separate correction toward a complete-file loudness target, then measure the exported file.