The deposition signal chain that prevents bad audio

Bad audio kills a deposition video.

If the audio is unusable, the video is unusable. Attorneys can read a transcript; they cannot watch a video they can't hear. The single most expensive mistake in legal video is unrecoverable audio — and it is almost always preventable.

The reference signal chain.

Lavalier mic on each speaker → mixer → camera audio in → backup recorder. The mixer is the redundancy point. The camera records the mixed signal. The backup recorder records the same mixed signal independently. If the camera fails, you have audio. If the backup fails, you have audio. If both fail, something has gone catastrophically wrong and you are about to have a hard conversation.

Mic placement actually matters.

Lavalier on the lapel, six inches below the collarbone, off-axis from the mouth. Boundary mic on the table as a fallback for the witness only — counsel covered by their lavaliers. Hand-off pattern when a deponent leaves the room: cut the mic, save the file, restart cleanly when they return.

Gain staging is the discipline.

Mixer at unity, channel gain to peak at -12 dB, camera input matched to the mixer's output reference level. Set it once before the witness arrives. Verify on every break. The most common signal-chain failure is somebody — usually you — bumping a knob during the day.

The three errors that kill the record.

(1) No backup recorder. (2) Camera audio set to auto-gain — which sounds fine in the room and unusable on playback. (3) Mic battery not changed at the morning break, dies at 2pm, you don't notice until you review.

Reading the meters during the deposition.

Glance at the mixer meters every five minutes. Glance at the camera audio meter every break. Listen on closed-back headphones for at least the first two minutes after you go back on the record after every break. If something has changed, you want to know inside two minutes — not at the end of the day.

Remote is a different problem, not an easier one.

Everything above assumes you own the chain end to end. On a remote deposition you own the last link and nothing before it — the witness's audio has already been through a laptop microphone, noise suppression, and a variable network before it reaches you, and none of that is fixable afterward. The remote-specific version of this discipline is in remote depositions over Zoom.

What happens to the audio after the day ends.

The redundancy you built in the room is worthless if the file only exists in one place that night. The backup recorder's file and the camera master both belong in the archive, and both are covered by the 1-2-3 archival rule. Recovering a deposition from a backup track you never copied off the recorder is a story every experienced member has heard, and none of them tell it about themselves twice.

Where this is taught.

The signal chain is module six of the CDVS curriculum — microphones, mixers, redundancy, gain staging, and these same failure modes worked through hands-on. Deposition Video 101 covers the gear list and what it costs, free, if you're still deciding whether to buy in.