# Sound recordings

These sound assets are adaptations of recordings published under [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/). Their license is independent of the project's source-code license. They are sound-design references, not recordings of a nuclear power station.

| Local file | Recording and creator | Source | Downloaded preview |
| --- | --- | --- | --- |
| `mechanical.wav` | “Oil burner blower loop.wav” — gear_clinkz | [Freesound #547858](https://freesound.org/people/gear_clinkz/sounds/547858/) | [HQ MP3](https://cdn.freesound.org/previews/547/547858_932556-hq.mp3) |
| `water.wav` | “Ambiance_Water_Pipe_Short_Loop_Stereo.wav” — Nox_Sound | [Freesound #648946](https://freesound.org/people/Nox_Sound/sounds/648946/) | [HQ MP3](https://cdn.freesound.org/previews/648/648946_9250976-hq.mp3) |
| `steam.wav` | “NYC steam radiator hiss.wav” — sethlind | [Freesound #265013](https://freesound.org/people/sethlind/sounds/265013/) | [HQ MP3](https://cdn.freesound.org/previews/265/265013_4101863-hq.mp3) |

License and source-page links were checked on 2026-10-10. The files were obtained from the public HQ previews rather than the original lossless downloads.

## Edits

All recordings were converted to 32 kHz mono, high-pass filtered at 28 Hz to reduce subsonic rumble, trimmed to steady passages, joined with a 0.6-second equal-power crossfade, DC corrected, and normalized with a maximum sample peak of 0.65. Outputs are 16-bit PCM WAVs.

- `mechanical.wav`: source passage 0.1–5.3 seconds; resulting loop 4.6 seconds.
- `water.wav`: source passage 2.0–12.6 seconds; resulting loop 10.0 seconds.
- `steam.wav`: source passage 16.0–26.6 seconds; resulting loop 10.0 seconds.

The application applies additional scene-dependent equalization, spatial placement, and gain. Primary coolant uses the water recording; the steam recording represents the separate secondary circuit.