https://forums.creativecow.net/thread/30/873530
This post is about far away sound but the principle is the same. ADR is always warmer, ,different mic, bass more boomy, slyabents more poppy, because the mic is usually closer. Depending on the ADR room, it could have more reverb or less reverb.
You may need to:
1. Eq away lower freqs
2. Remove or add reverb to either the ADR or mix studio reverb selective freqs, not just all
3. Multichannel compress due to distance from mic
4. Playback ADR outside to rerecord
A good trick is to measure the same distance to each mic and play a tone generator for 1 sec. At 3 different volumes and freqs.
This will measure the relative db, multichannel compression, reverb, noise.
Then post processing is super easy because you dont’t have to tweak your audio by ear.