Car crashes are easy to overdo. The quickest way to get believable results is to specify impact type, what breaks, how far the mic is, and how long the tail should ring out. Use these checks to pick the right download, or write a prompt that generates a collision that fits your edit without sounding like an explosion.
Choose the collision type and order
A rear-end tap, a head-on hit, and a side swipe all have different envelopes. If the visual shows contact then slide, prompt for a hit followed by grind. If it is a quick bump, keep the tail short and avoid long debris.
- Use words like rear-end bump, head-on impact, side swipe scrape, rollover thuds
- Call out hit count: single hit, double hit, chain reaction
- Specify what happens after impact: slide, spinout, stop, bounce
Lock perspective: inside, curbside, or far
Perspective changes the transient and the amount of air you hear. Close mics feel punchy and detailed; distant crashes soften the attack and let ambience carry the tail. Matching distance is often more important than making it louder.
- Close: sharp transient, more crunch detail, less room tone
- Distant: softened attack, longer air tail, reduced low-end
- Environment cues: street open air vs parking garage vs tunnel reflections
Define materials: metal, glass, plastic, debris
The most convincing crashes have specific textures. Glass adds bright sparkle and a tinkling decay, while body-panel crunch sits in the low-mid. If your scene shows airbags and interior movement, keep it mostly dull and thuddy rather than shard-heavy.
- Glass: bright top-end shards, short scatter tail
- Metal: gritty midrange crunch, occasional squeal or bend
- Plastic: lighter rattles, faster decay, less weight
Avoid common mix-killers
Crash SFX can easily mask dialogue and music. If your edit needs clarity, pick or generate a drier take with a controlled tail, then add space later only if the scene demands it.
- Skip overly cinematic booms when the picture is a minor bump
- Avoid constant broadband noise that fights speech in the same range
- Keep tails short for rapid cuts; longer decays work better on wide shots
