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What is chapterpass?

Audible's ACX has established eight technical standards that must be met, with any file that does not satisfy even one of these standards being rejected without exception. Chapterpass takes great care in preparing each chapter file to meet these requirements, ensuring that the RMS loudness falls between -23 and -18 dBFS, peak levels remain below -3 dBFS, the noise floor is kept under -60 dBFS RMS, and room tone is included at both the start and finish, all while producing a 192 kbps CBR MP3 file. Every audio file undergoes a thorough review to verify compliance with all specifications before it becomes available for download, allowing users to view precise measurements for each requirement at all checkpoints. The entire processing occurs in the user's browser through the use of WebAssembly technology, which ensures that audio files are kept on the user's device throughout the operation. Users can utilize the service without the need for an account; the first file is offered free of charge, while subsequent files incur fees of $36 per finished hour, $27 for five hours or more, and $18 for ten hours or more, all billed by the second. Furthermore, a complimentary measurement tool is available at /free-acx-check, enabling users to assess loudness, peak levels, noise floor, and silence padding in relation to the specifications without performing any mastering. Although Chapterpass specializes in mastering the essential technical standards, it does not engage in editing, noise removal, or any corrections to narration, thereby ensuring a smooth and efficient process for creators seeking to meet ACX requirements. This commitment to quality and compliance allows creators to focus on their content while trusting that their audio will meet industry standards.

What is Sonic Studio Mastering EQ?

A Mastering EQ is essential for maintaining clarity, as clients pour significant resources into achieving their ideal mix; thus, your processing should enhance the existing balance, ensuring that the EQ clarifies the sound instead of altering it. The Sonic Studio Mastering EQ Audio Units plug-in exemplifies this principle, enabling you to fully realize the potential of any recording without introducing unwanted coloration into the sound. The need for transparency becomes even more critical when addressing problematic frequencies, and with Sonic Studio Mastering EQ, you can be confident that you are precisely targeting the frequencies that require attention. Boasting 14 different filter topologies, including a range of parametric options from the 1st to the 4th order, as well as shelving, band pass, notch, RIAA, and Emphasis filters, it offers extensive versatility. In addition, it features metering and gain control to maintain optimal signal levels while providing integrated dither and word length adjustments, all in compliance with Audio Units standards, making it an invaluable tool for mastering engineers. This impressive array of features enables you to exert meticulous control over your audio, ultimately leading to an enhancement in the overall quality of your projects. By ensuring that every aspect of the mastering process is finely tuned, the Sonic Studio Mastering EQ truly stands out as a vital asset in any audio professional's toolkit.

Media

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Media

Integrations Supported

Additional information not provided

Integrations Supported

Additional information not provided

API Availability

API Availability

Pricing Information

$36 per finished hour
Free Version

Pricing Information

$8.99 per month
Billed annually
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

Mac

Customer Service / Support

Web-Based Support

Customer Service / Support

Standard Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

chapterpass

Date Founded

2026

Company Location

Italy

Company Website

chapterpass.com

Company Facts

Organization Name

soundBlade

Company Website

sonicstudiopro.com/sonic-studio-mastering-eq/

Categories and Features

Audio Mastering

Not specified

Categories and Features

Audio Mastering

Not specified

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