In short: A production sound mixer records the sound on set, mainly dialogue. They choose and place the microphones, set the levels on every take and flag problems to the director. Most start as trainees or sound assistants and work up over several years. A scripted shoot with moving actors needs one.
A production sound mixer records the sound on set, mainly dialogue, and is responsible for everything the microphones pick up, from the actors' voices to the generator in the next field.
What a sound mixer does on a shoot day
The sound mixer's day is a run of short, careful jobs, each of which the picture depends on. The most important ones happen before the first take.
- Agree the approach. Meet the director and the producer to agree how sound will be captured in the director's style of shooting.
- Scout for noise. Check the location for trains, traffic, air conditioning and anything else that will mark the dialogue.
- Set the levels. Keep the radio and boom levels right on every take, and check the recording before the actors start a second take.
- Flag the problems. If a take has a problem, say so at once. The director then chooses between another take and a fix in post-production.
- Handle the difficult jobs. Rustling costume, generator hum and a camera position that blocks a microphone all need a decision, often under pressure.
Dialogue that cannot be saved on set may be corrected later through ADR, where the actor re-records lines in a studio. The mixer's notes make that job faster.
Who they work with
The mixer takes direction from the director and coordinates with the producer. On the team they work with boom operators, who operate the boom and place radio or clip microphones, and sound assistants, who set up and check kit, manage the cables and help keep the sound reports. They also work with the camera, rigging, art, wardrobe and hair and make-up teams, because each one can affect what the microphones hear.
Kit and skills
The mixer's kit is booms, radio and clip microphones, a recorder with playback, and enough electronics knowledge to find a fault quickly. At Granary, the lavalier microphones for matched dialogue are Sanken COS-11D models, and recording runs through Reaper.
The skills that matter most are:
- Precise hearing, and the habit of listening to every take on headphones as well as watching the levels.
- Accurate record-keeping, so that the editor and the ADR team can find each take.
- A sense of how sound supports the story, as well as how clean it is.
- Communication under pressure, because a mixer who keeps a calm voice on a noisy set is valued.
How to become a production sound mixer
ScreenSkills describes a trainee route. The mixer's profile advises about three to four years as a sound junior or trainee before moving into the mixer role, and the National Careers Service profile lists these routes:
- Trainee and assistant work. Start as a sound trainee or assistant, learn the kit and the workflow, and move up as your work is trusted.
- College courses. The BTEC National Diploma in Sound Production and the BTEC National Extended Certificate in Sound Engineering are listed Level 3 options. The T Level in Media, Broadcast and Production is another route.
- Apprenticeships. Production company apprenticeships are scarce, so ScreenSkills points to the Creative Venue Technician standard, often gained in theatre before moving into film and TV.
- Short courses. The National Film and Television School's Location Sound Recording course is suggested for people who want a focused start.
- Bectu. The union offers reduced membership fees for new entrants, and its advice covers fair rates and safety training.
A degree is not required, though a sound engineering or music technology degree helps. A portfolio matters, because employers want to hear what you have recorded.
Do you need one on a small shoot?
- A podcast or a one-person interview: a sound person is still worth having for levels and monitoring, but one person can cover the recording and the camera.
- A scripted scene, a drama or a music video with actors moving: yes. Moving actors, boom positions and background noise need a dedicated mixer.
- A remote interview or a voiceover: not on set, because the recording is made by the person speaking or by a studio engineer.
Granary lists a sound recordist from £495 a day plus VAT, indicative, and the sound and post-production page covers how audio is recorded and finished. For a shoot that needs a mixer, say so when you enquire, because the room set-up is different.
Related roles
- What does a boom operator do?
- What does a sound assistant do?
- What does a 1st assistant director do?
- What does a director of photography do?
- What does a spark do?
Sources
- ScreenSkills, Sound mixer (film and TV drama) job profile, read 5 November 2026
- National Careers Service, TV or film sound technician job profile, read 5 November 2026
- Bectu, Runners and new entrants, read 5 November 2026
Related guides
Questions we get asked
What does a production sound mixer do?
They record the sound on set, mainly dialogue. They choose and place the microphones, set the levels on each take, and tell the director when a take has a problem such as noise, a rustle or a mic that has moved into shot.
What is the difference between a sound mixer and a sound recordist?
The terms overlap. Sound recordist is a common job title for the person who records on set, and production sound mixer is the title used for the head of the sound department on a drama. On a small job, one person often does both.
How do you become a production sound mixer in the UK?
ScreenSkills suggests starting as a sound trainee or junior and working up over several years. Level 3 courses such as the BTEC National Diploma in Sound Production and the NFTS Location Sound Recording course are listed routes.
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