Speaker Feedback Squeal

How it's made

Source

microphone noise recirculating through a loudspeaker, represented by a narrow noise seed and two phase-continuous tonal modes. This is a bounded model of feedback, not an unstable DSP loop.

Body

a 650-2600 Hz primary mode rises by 8-38 percent; a competing mode sits 1.13-1.34 times higher. The upper mode grows later as the microphone position changes; nearby modes beat in the dual preset.

Envelope

noise is audible immediately, tones emerge exponentially over 0.2-0.7 s, then compress into a sustained squeal. Pulling down the fader ends the loop with a 140 ms release and no switching click.

Layers

explicit second and third harmonics grow with loop level to model amplifier overload without unbounded distortion; a tracking Q=18 noise band and faint 0.7-8 kHz hiss retain speaker texture.

Modulation

seeded drift and 5-8 Hz flutter perturb pitch by less than one percent; slower gain flutter makes the saturated plateau breathe. A speaker low-pass rolls off energy above 8 kHz; output is dry.

Variation

seeded tuning +/-0.7 percent and flutter phase; controls set pitch, rise, competing mode, overload and instability. Presets cover low monitor howl, thin tweeter, dual-mode beating and runaway.

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