Impact reverse
209_impact_reverse
Impact reverse is a 4.212-second build sound effect, peaking at -1 dBFS, with its energy in the broadband band, it does mask dialogue. Align it to a cut on its end and apply -10 dB of gain.
Free preview — watermarked MP3, deliberately below the quality of the master WAV.
Measured acoustics
These figures are computed from the rendered audio, not typed by hand. Every sound is checked against its declared intent before it enters the catalogue: the envelope must match, nothing may clip, and there must be exactly one transient where one was specified.
| Duration | 4.212 s |
|---|---|
| Envelope | build |
| Align on | end where to anchor it against a cut |
| Attack | 4.011 s time to peak |
| Decay | 0.073 s |
| Peak level | -1 dBFS |
| True peak | -0.3 dBTP |
| Integrated loudness | -19.8 LUFS |
| Crest factor | 19.5 dB |
| Suggested gain | -10 dB when placed under typical programme material |
| Loopable | no |
| Dominant band | broadband |
|---|---|
| Spectral centroid | 3696 Hz |
| Brightness trend | 22.4 st centroid drift over the sound; negative darkens |
| 20–120 Hz (sub) | 12.0% of energy |
| 120–500 Hz (low) | 14.9% of energy |
| 500 Hz–2 kHz (mid) | 27.2% of energy |
| 2–6 kHz (presence) | 24.0% of energy |
| 6 kHz and up (high) | 21.5% of energy |
| Speech-band share | 51.3% |
| Masks dialogue | yes |
| Stereo correlation | 0.85 |
| Mono-safe | yes negative correlation partly cancels in a mono fold-down |
Price and licence
The master WAV is $0.02 in USDC over x402, non-exclusive — 44.1 kHz, peak-normalised to −1 dBFS, trimmed and faded, delivered base64 in JSON with these same acoustics. $5.00 buys it outright.
A buyout delists this specific file and retires its generation recipe, so it is never sold again. It is not a claim that no similar sound can exist — a comparable one could be generated from a different seed, and we would rather say so than overstate it.
Either way the sound is royalty-free: buy once, use it forever in unlimited commercial projects, no attribution required, nothing further to pay. The one restriction is that you may not redistribute it as a sound — read the full licence and terms of use, which is short.
Payment settles in USDC on Base mainnet (eip155:8453). These are agent endpoints:
a browser cannot complete them, so POST returns a 402 challenge rather
than a download. See the agent guide for a worked example.
| Free metadata | GET /api/sfx/209_impact_reverse |
|---|---|
| Free preview | GET /api/sfx/preview/209_impact_reverse.mp3 |
| Master WAV ($0.02) | POST /api/sfx/209_impact_reverse/wav |
| Exclusive buyout ($5.00) | POST /api/sfx/209_impact_reverse/buy |
Need something that isn't here?
We build custom sets to a brief — a house style across a whole project, or sounds the catalogue simply does not have. A brief becomes a fixed quote and a fixed delivery window before you pay anything: see commissions. For that, bundle pricing on a large selection, or any other enquiry, email contactus@sentedge.ai.
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