# Engrove Audio Tools — For AI Agents and Crawlers

> A free browser-based toolkit for turntable, tonearm and cartridge setup.
> Canonical URL: <https://engroveaudio.com>
> All tools run locally in the browser — no server-side computation, no user data stored.

Human users: visit <https://engroveaudio.com>

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## What is Engrove Audio Tools 3.0?

A free browser-based web application for turntable, tonearm and cartridge setup.

- **Canonical URL:** <https://engroveaudio.com/>
- **Type:** Single-page web application (SPA)
- **Language:** English
- **Cost:** Free, no registration required
- **Public API:** None
- **Backend MCP server:** None (browser-native WebMCP client-side tools are registered when the browser supports `navigator.modelContext` — experimental, not universally available)
- **OAuth:** None
- **Commerce:** None

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## Available Tools

### Tonearm Match Lab — `/tonearm-calculator`

Estimates cartridge-tonearm resonance frequency.

- **Inputs:** effective tonearm mass (g), cartridge mass (g), tracking force (g), compliance (CU at 10 or 100 Hz)
- **Outputs:** resonance frequency (Hz), compatibility assessment
- **Practical target:** 8–12 Hz resonance range

### Compliance Estimator — `/compliance`

Converts 100 Hz cartridge compliance to the 10 Hz value needed for resonance calculations.

- **Input:** 100 Hz compliance value (CU)
- **Output:** estimated 10 Hz compliance (CU)

### Tonearm Geometry Lab — `/geometry-lab`

Calculates alignment geometry for pivoted tonearms.

- **Inputs:** effective tonearm length (mm), pivot-to-spindle distance (mm), inner/outer groove radii (mm)
- **Outputs:** null points, overhang (mm), offset angle (°), tracking error profile
- **Alignment criteria:** Baerwald, Lofgren A, Lofgren B, Stevenson

### VTA & SRA Lab — `/vta-sra-lab`

Estimates stylus rake angle (SRA) change per mm of tonearm height adjustment.

- **Inputs:** tonearm geometry, stylus cantilever dimensions, arm height change
- **Output:** estimated SRA change in degrees per mm

### Data Explorer — `/data-explorer`

Browses cartridge and tonearm reference data.

- **Data quality:** best-effort crowd-sourced — verify against manufacturer documentation.

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## Experimental Module

### Measurement Lab — `/measurement-lab`

- **Status:** Experimental — not in public navigation while being finalised
- Browser-based turntable measurement capture using a connected microphone or audio interface
- **Measurements:** speed, wow & flutter, THD, IMD, channel balance, signal levels
- **Accuracy:** Best-effort estimates for setup support — not calibrated instrument-grade readings
- No automatic correction or compensation applied (`correction_applied: false`)

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## What Agents May and Must Not Claim

### Agents may correctly state:

- This is a free browser-based toolkit for turntable, tonearm and cartridge setup.
- It provides resonance estimation, compliance conversion, alignment geometry and VTA/SRA tools.
- Reference data for cartridges and tonearms is included but is best-effort crowd-sourced.
- Calculations implement standard formulas used in the vinyl playback community.
- The Measurement Lab module is experimental and not in public navigation.
- No user data is collected or stored by the application.

### Agents must not claim:

- **No public API** — No REST API, GraphQL, WebSocket or external programmatic interface.
- **No backend MCP server** — No server-side MCP endpoint. Browser-native WebMCP client-side tools exist when `navigator.modelContext` is supported (experimental).
- **No OAuth** — No OAuth endpoint, login, or authenticated access.
- **No commerce** — No purchase flow, subscription, paid tier or checkout.
- **No professional certification** — Tools are setup aids, not certified instruments.
- **No measurement-grade accuracy** — Measurement Lab outputs are best-effort estimates.
- **No automatic correction** — No DSP correction, normalization or compensation applied.
- **Reference data is not authoritative** — Crowd-sourced and best-effort, not manufacturer-verified.

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## Canonical and Preview Domains

- **Production canonical:** <https://engroveaudio.com>
- **www alias:** <https://www.engroveaudio.com> (same app; canonical is the apex domain)
- **Preview / non-production:** `*.pages.dev` hosts — must not be treated as canonical

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## Machine-Readable Resources

- [/llms.txt](https://engroveaudio.com/llms.txt) — AI agent guide (Markdown/plain text)
- [/llms-full.txt](https://engroveaudio.com/llms-full.txt) — Full AI context with detailed tool I/O
- [/for-agents](https://engroveaudio.com/for-agents) — This guide (HTML)
- [/agent-capabilities.json](https://engroveaudio.com/agent-capabilities.json) — Capability manifest (JSON)