Capturing Sound in a Horror Short Film: Why Dialogue Isn't Always Center Stage

In horror films, the location itself is often a distinct character. This shoot took place in a grim, unsettling basement with decaying walls, low-humming pipes, and what appeared—disturbingly—to be tree trunks serving as ceiling supports. With a script featuring no official dialogue, I was free to focus on production FX. Capturing sound is more than just recording the human voice, after all. Footsteps, room tone, rustling clothes and loud props, blood squibs; everything works together to immerse you in the film. And without dialogue, these production elements are a fantastic way to justify your existence as a sound guy.

This post explores techniques to capture those sounds, using ambient noise effectively, and understanding how the production sound will be used in post to craft a heightened atmosphere.

A grimy basement interior with exposed brick walls and crumbling infrastructure

Understanding the Acoustic Challenges of a Cramped Basement

Basements often have less-than-ideal acoustic properties. Hard surfaces like concrete walls, metal pipes, and low ceilings cause sound to bounce unpredictably, while footsteps from the floors above can make their way down with surprising clarity. Nearby train tracks penetrate the walls with powerful rumblings, and electrical devices and pipes hum and whir as you try to isolate specific noises in your recording.

Hard surfaces, a low ceiling, and an untreated door to the busy city outside. 10/10 sound conditions

Key challenges include:

• Reverberation: Close, hard surfaces reflect sound, making it tricky to capture audio that mimics what our ears hear.

• Ambient hums: Old pipes, rumbling trains, and electrical hums can interfere with clean recordings.

• Limited space: Tight quarters and wide lenses restrict microphone placement and movement.

• Unpredictable noises: Settling building sounds or distant street noise can intrude unexpectedly.

  
  

Directional microphones and portable sound-dampening materials are used by sound recordists to manage reflections, though confined spaces restrict their effectiveness. Typically, I’ll reach for a small-diaphragm condenser mic with a hyper/super-cardioid polar pattern. Why? Shotgun mics with interference tubes, designed for directionality, can produce unusual colorations when reflected sound waves mix with the direct audio signal. This adds a spring-reverb like effect, which is unflattering in situations where clarity and naturalness of tone are desired. A pencil condenser like my Schoeps CMC 6 with Mk. 41 capsule is a great tool for overcoming this.

But I'm not recording dialogue today. I'm staring at a prosthetic dummy of our lead actor with a tube of fake blood strapped to its chest.

Today is about tone and gore. I need to capture as much PFX as I can to aid in the sound design later, which will likely replace every single sound of today beyond the human voice. Considering this scene takes place in a basement with special importance to the story, I did something I would normally recommend against:

I used a shotgun microphone.

Considering the lack of dialogue, the increased directionality offered more benefit to me. In such a small space, it’s impossible to actually isolate the noises, but every bit of separation helps. And although I, and many others, will talk about the phase problems of using a shotgun in tight interiors, the truth is that the effect isn’t terribly pronounced, especially on quieter sources which don't bounce as powerfully off the walls. Many people wouldn’t notice the difference without closely monitoring an A/B comparison anyway, so I felt confident in going against the standard selection.

Techniques for Capturing Eerie Soundscapes

Horror shorts often rely on atmosphere over dialogue, and in this case there was no dialogue at all (unless you count the obligatory whimpers and cries of a man duct-taped to a wobbly chair on a tarped floor). In a dark basement with a masked villain, sound becomes a primary storytelling tool for conveying dread and anticipation.

To help with post, I positioned my shotgun mic as closely as I could to all the important noises throughout the shoot, from aiming directly at an actor’s boots as they scraped menacingly across the concrete, or at the plastic tarp as blood splashed onto it, to pointing my mic off at the wall or toward an appliance to capture the perfect ambience for the shot. The addition of a lavalier mic strapped to the actor’s chest allowed me to incorporate these noises without losing the actor’s performance, which was mixed in and out depending on the needs of each shot.

I also recorded various ambient noises separately:

• Low hums from electrical equipment

• Creaks from wooden beams

• Faint electrical buzzes

  
  

Layering these creates a rich, unsettling soundscape. Although this will all be done in post, having options from the actual production location is extremely useful, whether they are incorporated into the edit or are present purely for reference. In this case, the room tone was particularly effective at instilling a sense of dread—I feel bad for the person who lives there—and I suspect it will be used in the final mix.

And while ambient noise sets the mood, silence can be just as powerful.

A constant low-level hum or distant dripping provides a rhythm ripe for interruption. For example, a sudden stop in dripping water can signal change, setting up the entrance of the villain before they appear. This sort of strategic silence gets the audience to focus on their own anticipation. By recording diegetic sounds during production, you provide the sound design team with a template for crafting tension and narrative in the mix.

I’m always trying to make the post-production team’s experience as smooth as possible, not least because that team is usually me. Normally, this means capturing the dialogue as cleanly as possible, but sometimes you’re gifted with a fun day of sticking your mic in places the sun don’t shine. So when you’re the sound mixer on a shoot with no speaking roles, don’t be afraid to run around playing duck hunt with all the SFX sources. This is especially true for all the low-budget (i.e. paid in pizza) films out there, as it’s likely there won’t be a proper sound department for post-production, meaning the editor(s) will be almost completely reliant on your production sound.