Basement Ambience

How it's made

Source

furnace motor at 59 Hz with 118/177 Hz casing harmonics, slow speed wander and fan turbulence. Independent filtered pink noise models air in ducts (110-1800 Hz), not a synthetic sub-bass drone.

Body

damp concrete boundaries colour the air near 145 Hz with broad, low-Q resonances.

Drips

ceiling seepage falls every 2.2-6.5 s with timing jitter; 2.8-5.5 mm trapped bubbles rise in pitch, accompanied by a rounded 2 ms splash and a weaker delayed satellite drop, never a full-band impulse.

Settling

loaded joists slip every 6-17 s. A 0.6-1.4 s friction swell excites moving 170-760 Hz bands; uneven 9-17 Hz stick-slip amplitude and short damped wood modes give a distant structural creak.

Space

19/31/47 ms early reflections and a dark 0.4-0.9 s room tail place events in close concrete walls. The furnace stays nearly central; drips spread laterally and overhead creaks are narrower and darker.

Envelope

motor level wanders over seconds, with decorrelated low air; all event attacks are rounded.

Variation

seeded timing, bubble radius, pitch, friction and pan vary independently. Presets emphasize a working furnace, a wet corner, old joists, or a cramped low ceiling with shorter reflections.

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