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About
MasteringBOX is an AI-powered online audio mastering application that detects the dynamic and spectral characteristics of a track and applies the appropriate mastering adjustments. MasteringBOX allows you to adjust loudness and EQ controls to achieve the perfect result. You can download your mastered track in multiple audio formats and share it on social media and other platforms.
Over 5 Million Tracks Mastered. +500.000 users. 10 Years Innovating.
How does it work?
Analyze: MasteringBOX's algorithm analyzes the dynamic and spectral characteristics of your track to determine the best settings for mastering.
Master: Based on the data gathered earlier, MasteringBOX carefully processes your track to make the most of it.
Listen: Preview your track and fine-tune the parameters to your liking before saving the final master. Loudness and EQ control are available.
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About
Audible's ACX has eight technical checkpoints, and a file that misses one comes straight back. chapterpass masters each chapter file to spec: RMS loudness between -23 and -18 dBFS, peaks held below -3 dBFS, a noise floor under -60 dBFS RMS, room tone at the head and tail, and a 192 kbps CBR MP3 on the way out. Every output is verified against the full spec before download, and you see the measured value next to the requirement for each checkpoint. The processing runs in your browser through WebAssembly, so your audio never leaves your device. There is no account to create. Your first file is free, then $36 per finished hour, $27 from 5 hours, $18 from 10 hours, billed by the second. A free measurement page at /free-acx-check reads your loudness, peak, noise floor and silence padding against the spec without mastering anything. chapterpass masters the measurable technical specs. It does not edit your recording, remove noise, or fix narration.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
MasteringBOX is designed for artists, producers, and recording studios. Whether you're a beginner recording your first songs in a home studio or an experienced producer who prefers to delegate the mastering process, MasteringBOX delivers high-quality mastering in seconds.
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Audience
Audiobook narrators, indie authors narrating their own books, audiobook producers and post-production studios preparing files for Audible ACX
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and VideosNo images available
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Screenshots and VideosNo images available
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Pricing
€6/month
Free Version
Free Trial
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Pricing
$36 per finished hour
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationMasteringBOX
Founded: 2015
Spain
www.masteringbox.com
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Company Informationchapterpass
Founded: 2026
Italy
chapterpass.com
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Integrations
No info available.
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Integrations
No info available.
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