Sound design in contemporary cinema is largely an exercise in external replication. We are trained to mix the sound of a car crashing, a gun firing, or a crowd cheering as it would be heard by an objective observer standing in the room. But what happens when the observer can no longer hear the room? In Sound of Metal, director Darius Marder and sound designer Nicolas Becker answer this by turning the microphone inward.
Sound & Space: The Internal Mix
Bref, to authentically capture the subjective experience of sudden hearing loss, the team had to abandon traditional external recording techniques. They did not try to simulate deafness by simply lowering the master volume track. That is a cowardly, inaccurate shorthand.
Instead, Becker focused entirely on the “sense of inner sound”—how a human body perceives its own internal acoustics when external stimuli are removed. To achieve this, he deployed a bizarre arsenal of equipment: hydrophones, geophones, DIY stethoscope microphones, and highly sensitive contact microphones.
Trapped in the Bone
C’est le risque du métier. By utilizing contact microphones to record vibrations directly through the skin and bone cavities of the actor, the film achieves a suffocating level of subjectivity.
You are no longer listening to the protagonist; you are trapped inside his skull. You hear the dull, resonant thud of his own heartbeat and the muffled vibrations of his throat. The sound mix forces the audience to experience the terrifying physical isolation of deafness, proving that the absence of external sound is not silence—it is a prison of internal noise.
Insights regarding Darius Marder and Nicolas Becker’s groundbreaking use of contact microphones, hydrophones, and geophones to record internal body acoustics and simulate subjective hearing loss were drawn from technical interviews published in Deadline.