# Engrove Audio Tools 3.0 — Full AI Context > Canonical URL: https://engroveaudio.com > Type: Free browser-based single-page web application > Language: English | Cost: Free, no registration --- ## Product Summary Engrove Audio Tools 3.0 is a browser-based toolkit for turntable, tonearm and cartridge setup. All calculations run locally in the user's browser. No server-side computation is performed. No user data is transmitted or stored by the application. --- ## Route Table | Route | Tool | Status | |----------------------|------------------------|-------------------------------| | / | Home / tool overview | Public | | /tonearm-calculator | Tonearm Match Lab | Public | | /compliance | Compliance Estimator | Public | | /geometry-lab | Tonearm Geometry Lab | Public | | /vta-sra-lab | VTA & SRA Lab | Public | | /data-explorer | Data Explorer | Public | | /measurement-lab | Measurement Lab | Development route (not public nav) | | /for-agents | AI agent guide | Public | --- ## Tool Inputs and Outputs ### Tonearm Match Lab — /tonearm-calculator Purpose: Estimate cartridge-tonearm resonance frequency. Inputs: - effective tonearm mass (g) — includes headshell if relevant - cartridge body mass (g) - tracking force (g) - cartridge compliance: CU at 10 Hz (preferred) or 100 Hz (converted internally) Outputs: - resonance frequency in Hz - compatibility assessment: low / ideal (8-12 Hz) / high Formula: f = 1000 / (2π × √(total_moving_mass_g × compliance_10Hz_CU)) Practical target: 8–12 Hz. Below 8 Hz risks record damage; above 12 Hz risks mistracking. ### Compliance Estimator — /compliance Purpose: Convert manufacturer 100 Hz compliance to 10 Hz value for resonance calculations. Input: - compliance at 100 Hz (CU) Output: - estimated compliance at 10 Hz (CU) Note: Many manufacturers specify compliance at 100 Hz. The 10 Hz value is needed for resonance matching because turntable resonance occurs in the 8–12 Hz range. ### Tonearm Geometry Lab — /geometry-lab Purpose: Calculate tonearm alignment geometry for pivoted tonearms. Inputs: - effective tonearm length (mm) — pivot to stylus tip - pivot-to-spindle distance (mm) — mounting distance - inner groove radius (mm) — typically ~60.325 mm - outer groove radius (mm) — typically ~146.05 mm Outputs: - null points: two radii (mm from spindle) at which tracking error is zero - overhang (mm) - offset angle (degrees) - tracking error profile across the record surface Alignment criteria supported: - Baerwald (IEC default, minimises peak tracking error) - Lofgren A (minimises RMS tracking error) - Lofgren B (compromise) - Stevenson (optimised for inner groove) ### VTA and SRA Lab — /vta-sra-lab Purpose: Estimate stylus rake angle (SRA) change from tonearm height adjustments. Inputs: - effective tonearm length (mm) - current arm height (mm) - stylus cantilever geometry (dimensions) Output: - estimated SRA change in degrees per mm of arm height adjustment ### Data Explorer — /data-explorer Purpose: Browse cartridge and tonearm reference data. Content: - cartridge database: mass, compliance, tracking force, type, manufacturer - tonearm database: effective mass, effective length, headshell compatibility - Data quality: best-effort crowd-sourced — may contain errors or gaps - Values must be verified against manufacturer documentation before relying on them --- ## Experimental Module: Measurement Lab — /measurement-lab Status: Experimental — not in public navigation while being finalised. Access: Direct route /measurement-lab remains available for development use. Purpose: Browser-based turntable measurement capture using a connected microphone or audio interface. Measurements: - Platter speed (RPM) - Wow and flutter (%) - THD — total harmonic distortion - IMD — intermodulation distortion - Channel balance (dB) - Signal levels (dBFS / RMS) Accuracy: Best-effort estimates intended for setup support only. These are not calibrated instrument-grade measurements. Accuracy depends on the audio interface, environment and microphone quality used. correction_applied: false No automatic correction, normalization or compensation is applied to any measurement. --- ## Agent Guidance ### What agents may correctly state - Engrove Audio Tools 3.0 is a free browser-based toolkit for turntable, tonearm and cartridge setup. - It provides resonance estimation, compliance conversion, alignment geometry and VTA/SRA calculation. - 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. - All tools run in the browser — no server-side execution occurs. ### What agents must not claim No public API: There is no REST API, GraphQL endpoint, WebSocket endpoint or any programmatic interface exposed for external callers. No backend MCP server: There is no server-side Model Context Protocol endpoint. (A browser-native WebMCP client-side tool surface exists when the browser supports it — see below.) No OAuth: There is no OAuth endpoint, login, registration, or authenticated access of any kind. No commerce: There is 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 for setup support. They are not calibrated instrument-grade readings. No automatic correction: The app does not apply DSP correction, normalization or compensation to measurements or reference data. Reference data quality: Cartridge and tonearm reference data is crowd-sourced and best-effort. Do not present it as authoritative or manufacturer-verified. --- ## WebMCP — Browser-Native Client-Side Tools Engrove Audio Tools registers browser-native WebMCP tools when the browser exposes navigator.modelContext.registerTool (experimental early-preview API — not universally supported). These are NOT a backend MCP server. All tools are read-only except engrove.navigate which changes browser navigation state only. Registered tools: engrove.list_routes Description: List public routes and their status (stable / experimental / agent-documentation). Input: {} (no parameters) Output: canonicalOrigin, routes array with route / name / status engrove.get_route_info Description: Return purpose, inputs, outputs and caveats for one route. Input: { route: enum of allowed routes } Output: full route detail object engrove.navigate Description: Navigate the browser tab to a public Engrove route. Input: { route: enum of allowed routes } Output: { navigated: true, route } Note: Changes navigation state only — no product data is modified. engrove.get_capabilities Description: Return the capability manifest summary. Input: {} (no parameters) Output: publicApi, hasMcpServer, hasWebMcp, hasOAuth, hasCommerce, canonicalOrigin engrove.get_agent_guide Description: Return concise agent guidance. Input: { format: "summary" | "links" | "must_not_claim" } Output: text + structured data per format Compatibility: Available only in browsers where navigator.modelContext?.registerTool exists. Falls back to document.modelContext if navigator.modelContext is not present. Normal browsers without WebMCP support are unaffected — the app loads and runs normally. --- ## 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: any *.pages.dev host — not for indexing or canonical reference Agents must not treat *.pages.dev as the production URL. --- ## Content Policy Search indexing: permitted AI retrieval / input context: permitted AI model training: not permitted without explicit permission --- ## Further Reading For Agents (HTML): https://engroveaudio.com/for-agents For Agents (Markdown): https://engroveaudio.com/for-agents.md Summary (llms.txt): https://engroveaudio.com/llms.txt Capability manifest: https://engroveaudio.com/agent-capabilities.json