Actor who re-records dialogue in studio — replaces unusable or inaudible on-set takes. Requires timing precision and emotional continuity with original performance.
You're in the edit suite and realize: the on-set sound recording is too quiet, an airplane flew overhead, or the actor fumbled their lines. This is where the ADR actor comes in – the actor themselves, who goes into the ADR studio a few weeks later and re-records their dialogue. This only works if they synchronize precisely to the picture and preserve the emotionality of the original performance. Sounds simple, but it's technically demanding.
The ADR actor always works with timecode markers, loop points, and a video monitor. An ADR technician or post-production supervisor plays the scene – often in short 4–8 second loops – and the actor must lip-sync exactly to the recording. This is not the same as dubbing foreign-language films: here, the original performer replaces their own dialogue. Emotional consistency is crucial – if the original take was angry, the ADR version must also sound angry, not blandly neutral. Many actors find this frustrating because they work without scene partners in the studio and have to react to timing and technical cues instead of playing off their scene partners.
In practice, as a sound engineer or editor, you need patience. A complete scene with three characters and alternating dialogue can quickly take two to three hours – with breaks, retakes, and timing corrections. The ADR actor must remain on the same emotional level between Take 1 and Take 8. Good actors deliver exactly that during ADR; others sound artificial and technical. This is clearly audible later in the mix – especially when the original sound and the ADR version are placed next to each other.
Not all dialogue is re-recorded. Often, the ADR actor is limited to lines with sound problems or to a few intense scenes where the on-set sound quality isn't sufficient for the final mix. Some productions – especially TV and low-budget films – also use ADR for economic reasons: it's better to have a scene under control in the studio than to struggle with problematic set sound. This is a calculation, not an artistic decision.