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One section, no cascade — `fc` is the shelf's mid-point (half the `gain` is reached there), `Q` sets slope.\n\n```js\nlet params = { fc: 200, gain: 3, fs: 44100 }\nfor (let buf of stream) lowShelf(buf, params)\n```\n\n| Param | Default | |\n|---|---|---|\n| `fc` | `200` | Corner frequency, Hz |\n| `gain` | `0` | Shelf gain, dB (positive boosts, negative cuts) |\n| `Q` | `0.707` | Shelf slope (1 = RBJ \"shelf slope = 1\", steepest monotonic; lower is gentler) |\n| `fs` | `44100` | Sample rate, Hz |\n\nPass the same `params` object across successive calls — coefficients and filter memory are cached on it; a change of `fc`/`gain`/`Q`/`fs` rebuilds only the coefficients and the memory carries over, so state continues across block boundaries and automation is click-free.\n\n**Use when:** warming or thinning below a corner frequency — low end, rumble region, weight; the bottom half of a Baxandall-style tone stack.\n\n---\n\nPart of [@audio/eq](https://github.com/audiojs/eq) — the eq family umbrella.\n\nMIT © [audiojs](https://github.com/audiojs)\n","readmeFilename":"README.md"}