Audiobook Production

Master ACX-compliant audiobook production using Audible's technical standards and Richard Mayer's multimedia learning principles for engaging, professional audio.

When to Use This Skill

• Producing an audiobook for Audible/ACX distribution
• Creating audio versions of courses or written content
• Setting up narration workflow for long-form content
• Ensuring audio meets professional distribution standards
• Self-producing an audiobook as an author
• Managing audiobook production projects

Methodology Foundation

Source: ACX (Audiobook Creation Exchange) + Richard Mayer (Multimedia Learning)

Core Principle: Professional audiobook production balances technical excellence (meeting strict ACX standards) with engaging delivery (applying learning science principles). As Mayer's research shows: "People learn better from friendly human voice than machine voice" (Voice Principle).

Why This Matters: ACX/Audible rejects audiobooks that don't meet technical specifications, wasting production time and money. Beyond technical compliance, understanding how listeners process audio enables production choices that maximize engagement and retention.

What Claude Does vs What You Decide

What This Skill Does

1. Ensures ACX technical compliance - Specs for bit rate, sample rate, RMS, peaks, and noise floor
2. Structures audiobook projects - Chapter organization, credits, retail samples
3. Applies learning principles - Pacing, tone, and delivery that aid comprehension
4. Manages production workflow - From script to final master
5. Handles proofing and QC - Catching errors before submission

How to Use

Check ACX Compliance

Help me verify this audiobook meets ACX submission requirements.
[provide audio specs or describe setup]

Plan Audiobook Structure

Help me structure an audiobook from this manuscript:
Total word count: [X]
Chapters: [Y]
Type: [Fiction/Non-fiction]

Create Production Workflow

Create a production plan for my audiobook project:
Book length: [word count]
Narrator: [self/hired]
Deadline: [date]

Instructions

When producing audiobooks, follow this methodology:

Step 1: Understand ACX Technical Requirements

ACX has strict specifications that must be met for acceptance.

## ACX Audio Specifications (2026)

### File Format
- MP3, 192 kbps or higher (constant bit rate)
- 44.1 kHz sample rate
- Mono (single channel)

### Audio Levels
- RMS: -23dB to -18dB
- Peak values: -3dB maximum (no clipping)
- Noise floor: -60dB or lower

### File Naming
- Chapter files: [BookTitle]_[ChapterNumber].mp3
- Opening credits: [BookTitle]_Opening_Credits.mp3
- Closing credits: [BookTitle]_Closing_Credits.mp3

### Content Requirements
- Opening credits (first file): Title, author, narrator
- Closing credits (last file): "This has been [title] by [author], narrated by [narrator]"
- Each chapter file is standalone (no cross-file audio)
- Consistent room tone throughout

### Quality Requirements
- No extraneous sounds (mouth clicks, pops, page turns)
- Consistent audio quality across all files
- Retail sample: ~5 minutes of representative content

Critical: Run ACX Check tool on every file before submission.

Step 2: Prepare the Manuscript

Before recording, optimize the text for audio delivery.

## Manuscript Preparation Checklist

### Structure
□ Chapter breaks clearly marked
□ Section breaks identified (longer pause points)
□ Footnotes converted to in-text explanations or removed
□ Visual content (charts, tables) adapted for audio or noted for skip

### Pronunciation Guide
□ Character names with phonetic spelling
□ Foreign words and phrases
□ Technical terms and jargon
□ Place names and proper nouns
□ Acronyms expanded or spelled out

### Narrator Notes
□ Tone shifts marked
□ Character voice cues (if fiction)
□ Emphasis suggestions (minimal)
□ "As shown in Figure X" → adapted for audio
□ Author asides or commentary identified

### Timing Estimate
□ Word count per chapter
□ Total word count
□ Estimated runtime: words ÷ 9,300 = hours (approx)
   - 50,000 words ≈ 5-6 hours
   - 80,000 words ≈ 8-9 hours

Step 3: Set Up Recording Environment

Consistent, quality recording requires proper setup.

## Home Studio Essentials

### Minimum Equipment
- **Microphone**: USB condenser (AT2020, Blue Yeti) or XLR setup
- **Pop filter**: Essential for plosives
- **Mic stand**: Stable positioning
- **Headphones**: Closed-back, wired

### Room Treatment
- Record in smallest, most furnished room available
- Hang blankets on hard surfaces
- Use reflection filter behind mic
- Close windows, turn off HVAC
- Eliminate electronic hum (fridges, computers)

### Recording Software (DAW)
- Free: Audacity, GarageBand
- Professional: Adobe Audition, Reaper, Pro Tools
- ACX-specific: Hindenburg Pro (audiobook workflow)

### Test Recording Checklist
□ Record 30 seconds of room tone
□ Record test passage
□ Check RMS levels (-23 to -18 dB)
□ Check peak levels (below -3 dB)
□ Check noise floor (below -60 dB)
□ Listen for room echo or hum
□ Verify consistent mic positioning

Step 4: Apply Mayer's Multimedia Learning Principles

Science-backed techniques for engaging audio.

## Mayer's Principles for Audiobook Delivery

### Voice Principle
"People learn better from human voice than machine voice."
→ Warm, conversational delivery beats polished broadcast voice
→ Let personality come through
→ Avoid monotone "reading" voice

### Personalization Principle
"People learn better when words are conversational rather than formal."
→ Write/deliver as if talking to one person
→ Use "you" and "we"
→ Contractions are encouraged

### Segmenting Principle
"People learn better when content is in learner-paced segments."
→ Clear chapter breaks
→ Section pauses for complex material
→ Chapter summaries for dense non-fiction

### Redundancy Principle (for video/slides)
"People learn better from graphics and narration than graphics + narration + text."
→ For audiobooks: don't describe visual elements you can't show
→ Adapt visual content or acknowledge it's omitted

### Coherence Principle
"People learn better when extraneous material is excluded."
→ Cut verbal filler
→ Remove tangents that don't serve the chapter
→ Every word earns its place

Step 5: Production Workflow

Systematic process from script to master.

## Audiobook Production Pipeline

### Phase 1: Pre-Production (Week 1-2)
□ Manuscript finalized and proofread
□ Pronunciation guide complete
□ Chapter structure confirmed
□ Recording schedule created
□ Test recordings approved

### Phase 2: Recording (Weeks 2-6, varies by length)
□ Opening credits recorded first
□ Chapters recorded in order (usually)
□ Room tone captured each session
□ Daily backup of raw files
□ Notes logged for pickups needed

### Phase 3: Editing (Concurrent or following)
□ Remove mistakes and restart takes
□ Remove excessive breaths (keep natural ones)
□ Eliminate mouth clicks and pops
□ Smooth edits (crossfade)
□ Consistent pacing throughout

### Phase 4: Mastering
□ Noise reduction applied (light touch)
□ Compression for consistent levels
□ Limiting to prevent peaks
□ Final RMS check (-23 to -18 dB)
□ Export to ACX specs (192 kbps MP3, 44.1kHz, mono)

### Phase 5: Quality Control
□ Listen to every file start to finish
□ Check first/last 5 seconds of each file
□ Verify file naming convention
□ Run ACX Check or similar tool
□ Create retail sample (5 min)

Step 6: Credits and Sample

Specific requirements for opening, closing, and retail sample.

## Open