Sub Bass Drone

How it's made

Source

an imagined large diaphragm under sustained pressure; a 28-46 Hz sine carries the mass. A second, 17-percent-amplitude mode sits 0.07-0.22 Hz above it, giving slow pressure interference.

Body

a weak second harmonic models diaphragm asymmetry, 18-42 dB below the main mode before EQ. Brown-noise pressure is high-passed at 24 Hz and low-passed twice at a moving 48-70 Hz cutoff.

Envelope

6-18 s breathing cycles ride on slower seeded pressure wander; the bed never gates shut. A smooth 1.8 s entrance and 2.8 s exit prevent sudden displacement at edit boundaries.

Modulation

pitch wander is limited to 0.06 percent; the noise cutoff and second harmonic follow pressure with different depths, so a swell changes the spectrum as well as the amplitude.

Layers

all sub energy is mono and phase coherent between channels; a two-stage 105 Hz low-pass removes upper noise. No distortion, bright oscillators, reverb, or transient excitation is used.

Variation

seeded phases, pitch drift and turbulence evolve indefinitely. Presets choose abyssal near-pure pressure, faster warning swells, a slow undertow bed, or diffuse machinery pressure.

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