Screen Door Slap

How it's made

Source

a spring pulls a light porch screen door shut; a 2-5 ms filtered noise strike hits the stop.

Body

thin wooden rails have inharmonic modes at 240, 515, 890 and 1460 Hz, damped in 45-140 ms. There is no heavy closed-panel boom: an open mesh passes air instead of trapping a cavity.

Spring

five unequal coil modes near 380-2580 Hz fall 8-14 percent as tension releases, with 0.28-0.68 s decays and a small damped 23 Hz pitch flutter rather than a musical string note.

Mesh

band-limited noise at 0.9-6 kHz, coloured by two broad wire resonances and fluttered at 63 Hz, decays over 0.16-0.30 s; another short burst follows the rebound.

Envelope

faint spring motion begins immediately; the main slap arrives at 55 ms, one weaker contact at 160-240 ms, and a tiny latch tick 28 ms later. All layers fade before 0.95 s.

Variation

seeded tuning +/-2 percent and rebound jitter; size tunes rails, force changes strike bandwidth, spring changes coil ring, mesh changes wire looseness, bounce changes rebound strength.

Presets

everyday porch, soft close, taut spring snap and loose rattling mesh; dry close perspective.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.