Preparing Your Voice for Remote ACX Recording

Your voice is the instrument that brings the author’s words to life. In a remote recording session for ACX (Audiobook Creation Exchange), you must maintain consistent vocal quality across dozens of pages with no engineer to adjust levels for you. Proper preparation prevents fatigue, reduces the risk of vocal injury, and ensures that your narration sounds clear and engaging from the first track to the last.

Hydration and Diet

Start hydrating at least 24 hours before your session. Drink warm water (not ice cold) throughout the recording day. Herbal teas like chamomile or ginger with honey can soothe the throat. Avoid dairy products, which can increase phlegm; avoid caffeine and alcohol as they dehydrate the vocal cords. Add a small dish of water in your booth to maintain humidity.

Vocal Warm‑Up Routine

Cold voice leads to cracking, breathiness, and loss of endurance. Spend 10–15 minutes on gentle warm‑up exercises:

  • Lip trills – vibrate your lips together while humming up and down the scale.
  • Humming – start on a comfortable pitch and glide downward.
  • Tongue twisters – practice articulation drills (e.g., “unique New York”).
  • Sustained vowels – hold “ah,” “ee,” “oo” for 10 seconds at natural pitch.
  • Straw phonation – hum through a drinking straw to gently stretch the folds.

Never force your voice to reach a pitch that feels strained. Stop immediately if you feel pain.

Breathing and Posture

Diaphragmatic breathing supports consistent volume and reduces end‑of‑sentence tail‑offs. Sit upright in a chair that does not cause you to slouch. Keep your shoulders relaxed and your feet flat on the floor. Tilt your chin slightly down – looking up tightens the throat. Use a music stand or tablet at eye level to avoid bending your neck.

Rest and Vocal Care

Record after a good night’s sleep. Fatigue reduces articulation and pitch control. If you feel hoarse or have a cold, cancel the session – even a mild rasp will be audible in the final audio and may fail ACX’s quality check. Sleep with a humidifier in your room the night before a session.

Choosing and Preparing Your Recording Equipment

Professional‑grade results are possible with home gear. ACX does not require expensive studio equipment, but the gear must meet ACX technical specifications. The most important pieces are microphone, interface, headphones, and accessories.

Microphones

Condenser microphones are the standard for voice‑over because of their sensitivity and wide frequency response. A large‑diaphragm condenser (e.g., Audio‑Technica AT2020, Rode NT1, or Shure MV7) captures warmth and detail. USB condenser mics are acceptable if they offer adequate gain control (the Blue Yeti is common but can pick up room noise). For narrators on a budget, dynamic mics like the Shure SM58 work well if positioned close, but they require more gain and may sound less detailed.

Good microphones for audiobook narration:

  • Rode NT1 (large diaphragm, very low self‑noise)
  • Audio‑Technica AT2035 (cardioid, solid build)
  • Shure SM7B (dynamic, excellent for untreated rooms)
  • Blue Yeti X (USB, easy setup, but careful with background noise)

Audio Interface

If using an XLR microphone, an interface converts the analog signal to digital. Choose one with a clean preamp and at least 48V phantom power. Popular options: Focusrite Scarlett 2i2, Universal Audio Volt 2, or Behringer U‑Phoria UMC204HD. Ensure the interface can supply enough gain without introducing hiss.

Pop Filter and Windscreen

A pop filter or a thick foam windscreen stops plosives (“p,” “b,” “t”) from creating low‑frequency bursts that ruin takes. Position the filter 2–3 inches from the mic. A metal mesh filter does not affect high frequencies as much as nylon mesh.

Headphones for Monitoring

Closed‑back headphones are mandatory – open‑back designs leak sound into the mic and cause feedback. Use over‑ear models like Sony MDR‑7506, Audio‑Technica ATH‑M50x, or Beyerdynamic DT 770 Pro. Listen at moderate volume to avoid ear fatigue. Never record with headphones that add coloration (e.g., bass boost).

Cables and Stands

Use balanced XLR cables (at least 6 feet) to reduce interference. A sturdy desk‑mount boom arm or a heavy floor stand keeps the mic stable and isolates vibrations. Avoid cheap tripod stands that wobble.

Setting Up the Recording Space for Remote Sessions

Your environment has a greater impact on audio quality than the microphone itself. ACX requires background noise to be below ‑60 dB when listening in a quiet room. Follow these steps to achieve that.

Acoustic Treatment (DIY and Budget)

Instead of expensive foam panels, you can build a sound booth with blankets and PVC pipe. Hang heavy moving blankets on two sides of the recording desk to create a tunnel. Use a reflection filter (e.g., sE Electronics RF Pro) behind the mic. Place a carpet or rug on the floor to reduce footstep noise and flutter echo. Cover reflective surfaces like windows with moving blankets or poly‑fiber panels.

Minimizing External Noise

Record in the quietest room of your home, away from HVAC vents, refrigerators, and traffic noise. Turn off fans and air conditioning during takes – you can use a silent fan between takes. Seal door gaps with rubber weatherstripping. Record at night or early morning if your area is noisy. For occasional low‑frequency rumble (trucks, HVAC), a high‑pass filter in your DAW can help, but it is best to eliminate the noise at the source.

Microphone Placement and Monitoring

Position the mic capsule 6–8 inches from your mouth, slightly off‑axis (to the side of your mouth) to reduce plosives and sibilance. Avoid speaking directly into the center of the capsule. Use a pop filter as a consistent distance marker. Keep the microphone on a shock mount to isolate handling noise. Check your headphone mix: you should hear your voice clearly without latency or echo. In your DAW, enable direct monitoring (zero‑latency) through the interface if possible.

Software and DAW Preparation for ACX

You do not need expensive software. Audacity (free) and Reaper (inexpensive) are widely used. Configure your project to ACX file format requirements:

  • Sample Rate: 44100 Hz (CD quality).
  • Bit Depth: 16‑bit proven for audiobooks; 24‑bit is acceptable but must be converted to 16‑bit for final WAV.
  • Channels: Mono (one channel) – stereo is not allowed.
  • File Type: WAV (uncompressed) or MP3 192 kbps CBR (but WAV is preferred for submission).

Set your DAW’s input level so that your normal reading peaks between ‑6 dB and ‑3 dB (never hitting 0 dB). A quiet room environment should show a noise floor of around ‑65 dB or lower.

ACX Audio Standards You Must Know

ACX uses an automated quality check (ACX Check) that verifies these parameters:

  • Peak RMS: ‑23 dB to ‑18 dB (the average loudness over the whole file). You can adjust with a compressor or by changing your mic distance.
  • Noise Floor: Below ‑60 dB. Use the ACX Check tool or a VST meter (like YouLean Loudness Meter) to verify.
  • Maximum RMS: ‑18 dB (do not exceed).
  • No hum, clicks, pops, echoes, or reverberation.

Download the ACX Check plugin or use standalone software to test your audio before export.

Editing Workflow for Remote Narration

After recording each chapter, edit in your DAW:

  1. Remove mistakes and long pauses – cut out false starts, tongue slips, and breaths that are too loud (normal breaths are not removed but should be consistent).
  2. Noise reduction – use a noise print from a silent portion of your track. Apply gentle reduction (12–18 dB) to avoid a “swimming” sound.
  3. Normalize – set peak to ‑3 dB for headroom.
  4. Compress lightly – 2:1 ratio, threshold around ‑20 dB to even out volume without squashing dynamics (optional for some voices).
  5. Export as mono 44100 Hz 16‑bit WAV.

Preparing for a Successful Remote Session with ACX

When you are ready to record for an actual project (not just a test), follow this checklist:

  • Test recording – record a 30‑second sample and run it through ACX Check. Adjust gain and distance.
  • Read the manuscript first – mark pronunciations, character voices, and pacing notes.
  • Warm up – do your routine 30 minutes before the first take.
  • Prepare a glass of water and cough drops – avoid menthol or eucalyptus near the mic.
  • Turn off phone notifications and place a “Recording – Do Not Disturb” sign on the door.
  • Record in short blocks – 20–30 minutes of reading followed by a 5‑minute break to prevent fatigue.

Remote Collaboration Tips

If you work with a remote producer or engineer, agree on a file‑naming convention (Author_Book_Chapter##.wav). Share an early sample for approval on tone and pacing. Use cloud platforms (Dropbox, Google Drive) with version control. Schedule a live video call for the first 10 minutes of your session to get real‑time feedback on mic technique.

Final Quality Assurance Before Submission

Before uploading each file to ACX, perform one last listen with headphones to catch mouth clicks, sibilance, or background noise that the meters may miss. Use an audio repair tool like iZotope RX or the free Audacity “Click Removal” effect. Ensure chapter titles and track numbering match the audiobook’s layout. Run every file through ACX Check – even a single file that fails will delay the entire project.

With diligent preparation of your voice, equipment, and environment, you can consistently deliver audiobooks that meet ACX standards and earn high ratings from rights holders. For a deeper dive into voice care, consult a backstage guide to vocal warm‑ups and review the official ACX recording help page for updates on specifications.