# 📐 L2 Spec — Room Acoustics — image-source method (shoebox rooms) Mismatch-Only Spec
**ID:** `L2-260-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-260`](/artifact/l1/L1-260)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.22 · **Delta tier:** 5
> **⛓ On-chain block:** 41554039
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H m | m | 2 – 15 |
| L m | m | 2 – 30 |
| W m | m | 2 – 30 |
| Fs khz | kHz | 8 – 96 |
| Max order | — | 1 – 80 |
| Geometry error | — | 0.0 – 0.02 |
| Src rec pos error | — | 0.0 – 0.1 |
| Reflection coeff error | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
19.0 + 1.5*log2(max_order/1) - 20.0*reflection_coeff_error - 20.0*geometry_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.22 |
| Delta tier | 5 |
## 4. Fingerprint
`6d3d541e67977baadbb6a8828e7b2b9e7302bcf37cf4aac1777c6312b74d94ba`
## 5. On-chain Registration
- **Chain hash:** `0x257749c8aa776552b19a4adaede0defc45ea0a7189528a1c3f7495ad2319ec43`
- **Chain tx hash:** `0xa548ccb7c7d7763d7465936698636d6a09eaa19527c0e70f5e8fdcab40481a94`
- **Chain block:** `41554039`
---
## File Mapping
This bundle consists of: `L2-260-001.md`, `L2-260-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-260-001.md` | Source of truth — edit this | Human or LLM |
| `L2-260-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-260-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._