ADR Recording Guide: Mic, Room & Distance Match (2026)
Executive Summary
Great ADR is invisible. When the re-recorded line disappears into the production track, the audience never notices; when it fails, it pulls them straight out of the scene. This guide walks through the four disciplines that decide whether ADR blends or betrays itself: microphone choice matched to the production chain, room acoustics that avoid a studio signature, distance and geometry that replicate the on-set boom or lav position, and post-processing that matches (rather than beautifies) the original track. Every section names the current tools professionals actually use, gives numeric starting points for gain, distance, and frequency, and flags the failure modes that force expensive re-records. Read this before your next session and you will save hours in the mix and prevent the classic "why does this line sound like it was recorded somewhere else" note from the director.
Table of Contents
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Automated Dialogue Replacement (ADR) is a fundamental yet often misunderstood component of modern filmmaking. It is the process of re-recording dialogue in a studio after principal photography, typically to improve audio quality, clarify lines, or add new dialogue. Unlike voiceover recording, the primary goal of ADR is not to sound pristine in isolation. It is to blend with the production sound recorded on set, often disappearing entirely within the sonic fabric of the film. This guide covers the actionable strategies and technical considerations that let ADR reach that level of invisibility.
The challenge of ADR lies in matching the acoustic environment, microphone characteristics, and performance nuances of the original production sound. Filmmakers like Walter Murch, renowned for his sound work on films such as Apocalypse Now and The Conversation, treat sound as an integral part of shaping perception and emotion, not a decorative layer added after the fact. When ADR fails to blend, it pulls the audience out of the narrative and highlights the artifice of the filmmaking process. Masters of the craft understand that ADR is less about creating "perfect" sound and more about creating "matching" sound that serves the story.
Microphone Choice for ADR: Matching Production Sound
The first and most critical step in successful ADR is selecting the right microphone. The objective is not simply to use a high-quality studio microphone, but to use one that acoustically mirrors the microphone used during principal photography. This approach ensures that the tonal characteristics, polar pattern, and off-axis response of the ADR recording closely align with the on-set dialogue, making the re-recorded lines sonically indistinguishable from the production tracks.
Professionals prioritize matching the production recording chain. If the on-set sound logs indicate a specific boom microphone, the ADR session should ideally employ the same model. This commitment to matching extends beyond the exact model to the microphone's type (shotgun, lavalier), its polar pattern (supercardioid, omnidirectional), and its frequency response. These factors dictate how the microphone picks up direct sound versus ambient room reflections, directly impacting how the ADR will sit in the mix.
Commonly Used Microphones for ADR
A core kit of microphones covers most ADR matching scenarios. These are current, widely available models favored by film sound professionals:
Shotgun / Boom Microphones (for matching location dialogue):
* Sennheiser MKH 416: A short shotgun RF condenser microphone with a supercardioid/lobar pattern. It is a workhorse on film sets and ADR stages, often chosen when the production was boomed with a similar shotgun mic. Its distinct presence region (around 5-8 kHz) is a key characteristic to match.
Lavalier Microphones (for matching body-worn production mics):
* Sanken COS-11D: An industry-standard miniature condenser lavalier with an omnidirectional pattern, widely employed in film and television. It is often duplicated for ADR when lavalier microphones were the primary source on set. * DPA 6060 / 4060 Series: High-end omnidirectional lavaliers known for their consistent off-axis response and low noise floor. * Countryman B6: A very small omnidirectional lavalier, common in narrative work for its discreet profile and consistent sound.
Studio Vocal / Backup ADR Microphones:
* Neumann U87 Ai: A large-diaphragm condenser with multiple polar patterns, commonly used for narration or voiceover (VO) and for ADR when matching to set is less critical, or when the original production sound had a more "studio-like" quality. * Sennheiser MKH 50: A supercardioid condenser used interchangeably as a booth mic or a boom-substitute on ADR stages. * Shure SM7B: A dynamic cardioid microphone, often preferred for close, controlled vocal ADR in environments where noise rejection is paramount. Its design naturally minimizes room and background noise.
The Decision-Making Process
The choice of microphone for ADR begins with thorough reconnaissance. Sound reports and production logs from the set are invaluable for identifying the exact microphones used. If this information is unavailable, the ADR engineer must rely on careful listening to the production tracks. The presence of clothing rustle, a chest-centered tone, or a lack of "air" often indicates a lavalier was used, while a more open, directional sound suggests a boom microphone.
For sync dialogue, the default is to start with a shotgun microphone at a boom-like distance and angle. A lavalier is only deployed when the production sound unequivocally points to a body-worn mic.
💡 Pro Tip: When uncertain about the primary microphone used on set, record both boom and lavalier versions of the ADR lines during the session. This provides flexibility during the mix, allowing the dialogue editor or re-recording mixer to choose the best match or blend the two.
Common Mistakes in Microphone Selection
* Prioritizing "pretty" over "matching": Using a high-end studio vocal mic that sounds impressive in isolation but clashes with the production sound's character. This can make the ADR stand out as too clean or isolated. * Ignoring polar pattern differences: Swapping a supercardioid boom for a wide cardioid mic without understanding how this changes room pickup and off-axis coloration. The way a microphone rejects sound from different angles is crucial for consistent room tone. * Incorrect lavalier placement: Recording lav-style ADR with the mic positioned too close under the chin or directly over the mouth, which results in a tone that does not resemble the typical chest or torso placement of a production lavalier.
Matching the microphone is foundational. As Randy Thom, another titan of sound design, often stresses, the goal is to make the sound serve the narrative subtly. An unmatched microphone choice undermines this subtlety from the outset.
Room Match and Acoustic Strategy: Making ADR Blend with Location Sound
Beyond microphone choice, the acoustic environment of the ADR studio is paramount. The goal is to make the re-recorded dialogue sound as if it originated from the same physical space as the original scene, or at least to avoid betraying its studio origin. This involves careful acoustic treatment and a strategic approach to capturing room characteristics.
A professional ADR stage is designed to be acoustically neutral, offering a controlled environment that can be adapted to simulate various on-set acoustics. This means the room itself should not impart a strong, identifiable character. Many stages are moderately damped, allowing for some natural early reflections, but not so "dead" as to sound unnatural. The true art of room matching then comes in the post-processing phase, where reverbs and ambiences are added to precisely replicate the production environment.
Acoustic Treatment and Practical Setups
Even without a purpose-built ADR stage, effective acoustic treatment can achieve a high degree of control. Current best practices involve:
* Soft furnishings and acoustic panels: Curtains, rugs, couches, and purpose-built acoustic panels using materials like rock wool or fiberglass are employed to absorb reflections and tame flutter echoes. * Absorption around the microphone: Placing absorption directly behind and around the microphone is crucial. This can involve a reflection filter directly behind the mic, or heavy moving blankets, quilts, or portable gobos on the wall behind the talent. A rug on the floor helps reduce floor-bounce reflections. * Budget-conscious solutions: For smaller setups, DIY panels constructed with rock wool or dense fiberglass (target density 40-60 kg/m3, thickness 4 inches or more for broadband absorption) in fabric frames, along with bass traps, are effective. These should be strategically placed on the wall behind the mic and on the ceiling directly above the talent, as these surfaces are often primary contributors to early reflections.
Current Tools and Products for Acoustic Treatment
The market offers a range of effective acoustic treatment products that are widely used in professional and project studios:
* Auralex Studiofoam panels and bass traps: Foam-based treatments that are a standard for dampening small to medium-sized ADR rooms. * GIK Acoustics 244 panels and bass traps: Broadband absorbers found in many professional studios and post-production facilities, offering effective absorption across a wide frequency range. * sE Reflexion Filter Pro: A portable vocal booth alternative that mounts directly to a mic stand, providing immediate acoustic isolation and reflection reduction behind the microphone. * Primacoustic Broadway panels: Rigid fiberglass wall panels that offer a more permanent and aesthetically integrated solution for acoustic control.
Workflow: Matching the Production Room
The process of matching the room begins with a critical listening phase. Before any recording, the ADR engineer or supervisor listens intently to the original production clip, noting:
* Reverb type and intensity: Is the scene in a tight, dry interior, a large hall with distinct decay, or an open outdoor space? Car interiors have very specific acoustic signatures that need to be considered. * Early reflections: How quickly do the first reflections return? A small, hard-walled space will produce dense early reflections within 5-20 ms of the direct sound; a cathedral may show first reflections beyond 50 ms with a long RT60 tail. * Noise floor content: HVAC hum, distant traffic, refrigerator compressors, or exterior wind all leave signatures that the ADR track will have to sit against.
Common Mistakes in Room Acoustics
* Overly anechoic recording: Recording ADR in a booth that is too "dead" can lead to an unnatural, close sound that feels disconnected from the scene's environment, especially if appropriate space is not added later. * Untreated room reflections: Recording in an acoustically untreated space, such as a typical office, can introduce strong, undesirable reflections (like flutter echo) that are difficult or impossible to remove cleanly in post-production. * Neglecting room tone: Failing to record at least 30 seconds of the ADR studio's specific room tone. This room tone is vital for blending ADR with production dialogue and for creating continuous noise beds. For more on managing noise, see our guide on Handling Problem Voices: Whispers, Shouts, Overlapping Dialogue.
💡 Pro Tip: Before committing to a full ADR session, record a short test line and immediately A/B it against the original production audio in the control room. This quick check can reveal issues with microphone choice, distance, or room acoustics, allowing for adjustments before significant time is invested.
The meticulous attention to room acoustics, championed by sound artists like Gary Rydstrom in films such as Saving Private Ryan, ensures that every spoken word, whether recorded on set or in a studio, contributes to a cohesive and believable sonic landscape. For a production-side view of what makes location dialogue easier (or harder) to match in ADR, see our Set Noise Triage: Generators, Fridges, HVAC, Traffic, and Crew Protocol guide.
Distance and Placement Strategy: Re-Creating On-Set Mic Geometry
Distance is arguably the most critical variable in making ADR blend. The objective is not to find an "ideal" studio vocal distance, but rather to painstakingly replicate the mic-to-mouth geometry and movement that occurred during principal photography. This directly influences proximity effect, room tone pickup, and the overall sense of intimacy or distance in the dialogue.
While general guidelines exist for recording vocals in a studio, these are often superseded by the specific demands of matching a production track.
Baseline Distance Guidelines (for controlled studio tone)
For general spoken-voice recording, these serve as starting points:
* Large-diaphragm condensers: Typically positioned 6-12 inches (15-30 cm) from the mouth, using a cardioid pattern. Input gain is usually set so peaks hit between -12 and -6 dBFS. Many voiceover engineers start at 6-8 inches from the capsule. * Dynamic vocal mics (e.g., Shure SM7B): Often placed closer, around 2-4 inches (5-10 cm) from the mouth, to achieve a controlled, intimate tone and maximize proximity effect. * Short shotguns (e.g., MKH 416): For ADR booth work, 30-60 cm from the mouth is a common starting range, angled slightly off-axis and above the mouth to mirror a boom pointing down.
However, in ADR, these distances are fluid and dictated by the apparent microphone distance in the production sound.
Production-Matching Distance Strategies
ADR professionals "listen" to the production track to infer mic placement:
* Boomed dialogue: If the original scene sounds like it was boomed from above at a typical on-set distance (e.g., 60-80 cm from the actor's mouth), the ADR shotgun mic will usually be placed closer, perhaps 30-50 cm from the mouth, slightly above and aimed at the face. This closer placement compensates for the controlled studio environment and allows for a more direct, focused sound that can later be blended with room ambience. * Lavalier dialogue: If the dialogue is clearly lavalier-based (often indicated by a more direct, chesty sound with less room), the ADR lavalier should be placed in a similar position, typically 15-20 cm below the chin, mimicking the on-set body-worn placement. * Wide masters vs. tight coverage: If the scene alternates between a wide master (mic further away, more room) and tight coverage (mic closer, drier), the ADR should typically match the closest coverage angle and rely on reverb matching to sit against wider shots.
Crucially, consistency of distance is paramount throughout the ADR take. Any movement by the actor that changes their distance from the mic will alter the sound, making it difficult to match across lines. Floor markings, mic stand heights, and angles should be noted and maintained.
Angle and Proximity Control
Beyond distance, subtle adjustments to angle and the use of pop filters are standard practice:
* Off-axis angle: A slight off-axis angle (10-15 degrees) can help reduce plosives (P and B sounds) and harsh sibilance without sacrificing clarity. * Pop filters: Essential with condenser microphones, pop filters are typically placed about 3 inches (7-8 cm) from the mic, with the talent positioned an additional 3-5 inches (7-12 cm) behind the filter. This creates an effective working distance of 6-8 inches (15-20 cm) from the mic capsule. The goal is to adjust distance and angle first before resorting to processing.
Multi-Mic / Boom + Lav ADR
For maximum flexibility, some ADR sessions record both a boom and a lavalier simultaneously. When doing this, the classic 3:1 rule from live sound engineering is often applied to minimize phase issues: the second microphone should be placed at least three times the distance from the sound source as the first microphone. For example, if a lavalier is on the chest at 20 cm from the mouth, the boom shotgun should be placed at 60 cm or more from the mouth. This allows mixers to choose or blend the mics later without significant comb filtering artifacts.
Level and Technical Standards
ADR recording must adhere to strict technical standards to ensure compatibility and quality throughout the post-production pipeline:
* Sample Rate and Bit Depth: Recording at 48 kHz / 24-bit is the industry standard for film and television audio. This provides ample dynamic range and fidelity for subsequent processing. Some high-end features capture at 96 kHz / 24-bit when the mix stage requests it. * Input Gain: Set input gain so that peaks typically register between -12 and -6 dBFS, with average levels around -18 dBFS. This ensures sufficient headroom, preventing digital clipping, which is irreversible and destructive to audio quality. * No Clipping: Never allow the digital meter to hit 0 dBFS. Digital clipping results in harsh distortion that cannot be repaired cleanly.
Common Mistakes in Distance and Placement
* Matching visual distance, not audio distance: ADR engineers sometimes mistakenly try to match the apparent distance of the actor from the camera in the shot, rather than the actual distance of the boom microphone from the actor's mouth, which is often much closer. * Inconsistent actor movement: Allowing the actor to move off-axis or change their distance from the microphone mid-line. ADR requires a high degree of physical consistency from the performer. * Over-proximity with boom mics: Recording boom ADR too close can introduce an exaggerated proximity effect, making the voice sound unnaturally boomy or "big" compared to the production sound.
💡 Pro Tip: For each scene, use floor tape to mark the actor's standing position and note the exact height and angle of the boom mic stand. Documenting these settings in the session logs allows for precise replication if pickups are needed weeks or months later.
The meticulous control of mic distance and placement, as practiced by sound mixers like Chris Munro in films like Gravity, ensures that the re-recorded dialogue maintains the same sonic perspective, whether the character is whispering intimately or shouting across a vast landscape.
ADR Session Workflow: Performance, Sync, and Noise Management
ADR is not merely a technical recording process; it is a delicate balance of technical precision, artistic performance, and meticulous noise management. The professional ADR session aims to achieve tight lip-sync, preserve the emotional integrity of the original performance, and deliver clean, consistent audio tracks that integrate into the final mix.
Current Tools and Techniques for ADR Sessions
The modern ADR workflow relies on sophisticated digital audio workstations (DAWs) and specialized cueing systems:
Picture and Sync:
* Avid Pro Tools Ultimate: The de facto industry standard for film and television ADR sessions, offering deep video integration, advanced editing features, and comprehensive cueing tools. * Fairlight (Blackmagic DaVinci Resolve): An increasingly popular integrated picture and audio post-production environment, especially in facilities that prioritize a unified workflow. * ADR Cue Systems: These systems use visual cues such as streamers (vertical lines that sweep across the screen) and beeps (audible tones) to guide the actor''s performance and ensure precise synchronization with the picture. Clip groups and markers within the DAW also help organize and manage ADR takes.
Monitoring and Communication:
* Closed-back studio headphones for talent: Models like the Beyerdynamic DT 770 Pro or Sony MDR-7506 are standard, providing isolation for the actor to hear guide tracks and cues without bleed into the microphone. * Reference monitors in the control room: High-quality nearfield monitors (e.g., Genelec 8000 series, Yamaha HS series) are crucial for the ADR team to critically compare the ADR performance against the original production audio.
Noise and Environment Management:
* Eliminating ambient noise: During takes, all sources of extraneous noise must be silenced. This includes turning off HVAC systems, computers with noisy fans, refrigerators, and any other appliances that contribute to the room''s noise floor. * Recording room tone: A critical step is to record at least 30 seconds of the ADR studio''s room tone at the specific mic setup used for each scene. This provides a clean noise bed for dialogue editors to use for transitions and to fill gaps in the dialogue.
Session Practices
A successful ADR session prioritizes both technical accuracy and performance capture:
* Performance briefing: Before recording, the original scene''s audio and picture are played for the actor. This allows them to reconnect with the emotional beats, physicality, and intention of their original performance. * Headphones and talkback: The actor wears headphones to hear the guide track (original production dialogue and sound effects) and the director''s or engineer''s talkback instructions. This allows for real-time direction without the actor having to turn away from the microphone. * Multiple takes: ADR sessions typically involve multiple takes: * Technical takes: Focused on achieving precise lip-sync and timing. * Performance takes: Emphasizing emotional nuance and dramatic impact. Professionals often capture both, allowing the dialogue editor and mixer flexibility.
Common Mistakes in ADR Sessions
* Rushing the performance: Skipping adequate rehearsal of lines and timing, leading to technically accurate but emotionally flat or disconnected performances. * Ignoring noise floor: Failing to manage the studio''s noise floor or neglecting to capture room tone. This makes it significantly harder for mixers to integrate the ADR into complex soundscapes without it sounding isolated. * Actor movement: Allowing actors to turn away from the microphone to view the screen or read the script. This breaks on-axis consistency and alters the microphone''s pickup pattern and tone.
💡 Pro Tip: Place the script at mic height, directly behind or beside the microphone, so the actor can read without moving their head off-axis. While encouraging physical performance, instruct the actor to "gesture from the elbows, not the torso" to maintain consistent head position relative to the mic.
The balance between performance and technical execution in ADR is a hallmark of great filmmaking. As evidenced in the precise re-recording work for films like The Social Network, where ADR was used extensively to refine dialogue, the smoothness of the process hinges on disciplined workflow.
Post-Processing and Integration: Making ADR Disappear in the Mix
The final stage of ADR involves processing and integrating the re-recorded dialogue into the film''s existing soundscape, making it acoustically "disappear." This requires a nuanced approach to tonal balance, dynamics, and spatial matching, ensuring that the ADR tracks are indistinguishable from the production sound.
The goal is not to make the ADR sound "better" in isolation, but to make it sound "like" the production track. This often means subtly degrading the ADR to match the noise floor, frequency response, or room characteristics of the original location recording.
Current Software Tools (Shipping, Widely Used)
A suite of specialized software tools is employed for ADR processing and integration:
DAWs / Audio Post Platforms:
* Avid Pro Tools: Remains the primary environment for dialogue editing, ADR comping (assembling the best takes), and mixing. * DaVinci Resolve Fairlight: Increasingly utilized for its integrated workflow and powerful audio post capabilities.
Noise Reduction / Dialogue Enhancement:
* iZotope RX 11: The industry-standard suite for dialogue cleanup, offering modules for De-noise, De-click, De-reverb, De-ess, Mouth De-click, Dialogue Isolate, and Spectral Repair. * Cedar DNS systems: High-end hardware and software solutions used in broadcast and film for real-time, transparent noise suppression. * Waves Clarity Vx / Clarity Vx DeReverb: AI-based dialogue plugins used for de-noising and de-reverberation in real time. * Accentize dxRevive Pro: A neural dialogue restoration tool used to rescue voices from problematic production recordings and to match ADR to noisy production tracks.
EQ, Compression, and Dynamics:
* Stock DAW plugins: Pro Tools and Fairlight offer capable built-in EQs and compressors. * Third-party plugins: * FabFilter Pro-Q 3 / Pro-Q 4: Precise digital equalizers, invaluable for detailed tonal matching and surgical frequency adjustments; Pro-Q 4 adds intelligent matching curves. * FabFilter Pro-C 2, Waves SSL E-Channel: Common choices for gentle, transparent dialogue compression to even out dynamic range. * Soothe 2 by oeksound: A dynamic resonance suppressor used to tame harsh sibilance or resonant peaks without static EQ.
Reverb and Room Matching:
* Audio Ease Altiverb 8: A convolution reverb celebrated for its extensive library of impulse responses from real-world spaces (concert halls, churches, car interiors, etc.). It is widely used to match ADR to the specific acoustics of a scene. * Waves IR1, H-Reverb, Lexicon PCM Native Reverb: Popular tools for simulating spaces when an exact impulse response is not available or a more stylized reverb is desired. * LiquidSonics Cinematic Rooms: A modern algorithmic reverb designed for post-production dialogue and room simulation.
Established Practices for Integration
The process of integrating ADR is iterative and relies heavily on critical listening:
* Start clean and dry: ADR tracks should begin as dry and clean as possible. Processing begins by applying EQ and dynamics to match the tonal character of the adjacent production dialogue. This often involves: * A gentle high-pass filter (HPF) to remove low-end rumble (typically 60-100 Hz for male voices, 100-150 Hz for female voices, adjusted per voice and mic). * Subtle presence boosts or cuts (e.g., 3-6 kHz) to match clarity and brightness. * A narrow cut around 200-400 Hz if the production track is thinner or boxier than the ADR. * Convolution Reverb: This is the primary tool for spatial matching. An impulse response (IR) from a similar acoustic space to the scene is loaded into a convolution reverb plugin. Parameters like pre-delay and early reflections are adjusted to match the sense of distance, while reverb time (RT60) is matched to the scene''s decay. * Layering Room Tone: Room tone from both the production recording and the ADR studio is essential. These are layered and crossfaded underneath dialogue edits to ensure continuous noise beds, preventing unnatural silence or shifts in ambient noise.
Common Mistakes in Post-Processing
* Over-processing with noise reduction: Aggressive use of noise reduction can introduce metallic or "swirly" artifacts, making the ADR sound unnatural and stand out. * Inconsistent EQ philosophy: Applying a different EQ aesthetic to ADR than to production dialogue, resulting in ADR lines that sound overly "studio" or excessively bright compared to the raw production tracks. * Mismatched reverb: Using reverb that does not accurately reflect the early reflection patterns of the scene''s space (e.g., a large, diffuse hall reverb for a small, reflective kitchen), leading to a spatial disconnect.
💡 Pro Tip: When production dialogue is noisy, resist the urge to make ADR perfectly clean. Sometimes, adding a subtle bed of controlled ambient noise or a light mono hiss to the ADR track helps it "sit" more naturally within the texture of the original, noisier production sound.
The art of ADR integration, epitomized by mixers like Skip Lievsay in films such as Roma, is about creating an illusion. It is about meticulously shaping sound so that every word feels organically part of the film''s world, regardless of where or when it was originally recorded. For the broader continuity work that surrounds ADR, see our Dialogue Editing Workflow: Cleaning, Matching, and Continuity guide.
Interface and Handoff Notes
Effective ADR hinges on clear communication and standardized deliverables between departments.
What You Receive (Upstream Inputs)
* Picture Editor''s AAF/OMF: The primary delivery from picture editorial, containing the edited dialogue tracks, music, and sound effects, along with the locked picture reference. This should ideally be organized with clearly labeled tracks for production dialogue. * Reference Video with Burn-Ins: A video file (e.g., ProRes, H.264) with visible timecode, scene/take information, and often a 2-pop or 3-pop sync reference. This is critical for visual sync during ADR sessions. For more detail, see Reference Video Specs for Sound: Burn-Ins That Prevent Sync Disputes. * Sound Reports / Production Logs: Detailed notes from the production sound mixer, indicating microphones used, gain settings, issues encountered, and timecode for problematic takes. These are invaluable for mic matching. * ADR Cue Sheet (Spotting List): A list generated by the dialogue editor or ADR supervisor, detailing every line requiring ADR, its timecode, original dialogue, and reason for replacement. This list is often created during a "spotting" session with the director. For the upstream planning that produces this document, see ADR Planning From the Script: Spotting, Scheduling, and Performance Direction.
What You Deliver (Downstream Outputs)
* ADR Audio Files: High-quality WAV files (48 kHz / 24-bit) for each recorded ADR line, typically consolidated to start at the session''s reference timecode. Files should be clearly named (e.g., Scene_Line_Character_Take_MicType). * ADR Pro Tools/Fairlight Session: A clean, organized session containing all recorded ADR tracks, guide tracks, and any preliminary processing (e.g., EQ, noise reduction). * ADR Room Tone: Separate WAV files of the ADR studio''s room tone, recorded at each mic setup used. * Session Notes/Log: Documentation detailing microphone choices, distances, gain settings, and any specific notes for each ADR take or line. * M&E-Compatible Stems: Once the dialogue mix is complete, ADR tracks must be included in the fully-filled M&E stem so international dubs can drop new dialogue over a clean bed. See M&E Deliverables: How They''re Built and Why Distribution Requires Them.
Top 3 Failure Modes for ADR
1. Mismatched Acoustics: The most common failure, where the ADR sounds like it was recorded in a completely different room than the scene, drawing attention to itself. This stems from poor mic choice, inadequate room treatment, or incorrect post-processing of reverb/ambience.
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- ADR Planning From the Script: Spotting, Scheduling, and Performance Direction
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