Oxford Limiter HDX by Sonnox limiter plugin interface

Oxford Limiter HDX: Peak Limiter Plugin by Sonnox

Oxford Limiter - HDX is a peak limiter plugin from Sonnox, built in AAX format for Avid HDX systems. It offers attack, release and variable soft-knee controls, plus an Enhance section for raising perceived loudness.

AAXWindowsmacOS64-bit

AVAILABLE ATPlugin Boutique

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01Overview

Oxford Limiter - HDX is designed for pushing a mix to high loudness while keeping its detail. Its peak limiting section gives control over attack, release and soft-knee, and the Enhance section adds perceived loudness without dulling the sound. A Recon meter shows the actual signal rather than a sampled one, and Auto Comp corrects reconstruction errors using the ITU-R BS.1770-4 true peak standard. The plugin is intended for DSP use on Avid HDX systems so it does not load the host processor.

Best for

Mastering loudness
Mix bus limiting
Streaming-ready masters
Final output dithering
Avid HDX sessions

Developer: Sonnox
Category: Limiters
Store: Plugin Boutique

02Key features

What you get

Peak limiting with attack, release and variable soft-knee
Enhance section to increase perceived loudness
Recon meter showing actual rather than sampled signal
Auto Comp correcting recon errors per ITU-R BS.1770-4
TPDF dither for 24-bit and 16-bit output
Four variable-strength noise shaping modes
Full backwards compatibility with previous plugin versions
Factory preset library to start from

03In depth

Limiting and Loudness Controls

The core of Oxford Limiter - HDX is peak limiting with adjustable attack, release and variable soft-knee. Together these let you shape how aggressively the limiter engages on transients and how smoothly it recovers afterward.

The Enhance section is aimed at perceived loudness. Sonnox describes it as a final polish that raises the sense of loudness at the output stage, which can help a track hold its energy on streaming, radio and club playback.

The Recon meter displays the actual reconstructed signal instead of sampled peaks. Auto Comp then corrects reconstruction errors while keeping overall loudness, conforming to the ITU-R BS.1770-4 true peak measurement standard.

Dither and Output Options

For final output, the plugin provides TPDF dither for 24-bit and 16-bit word lengths. Four types of variable noise shaping are available, and four variable-strength noise shaping modes are included for highly dynamic program material.

You can audition dither before applying it, which makes it easier to judge the effect on your own material before committing to a word length.

04Specs

Will it run?

Formats, systems and requirements as listed by Plugin Boutique. Missing details are left out, not guessed.

Developer	Sonnox
Type	Plugin
Category	Limiter
Formats	AAX
Operating systems	Windows, macOS
Architecture	64-bit

05FAQ

Questions, answered

What formats does Oxford Limiter - HDX support?

Oxford Limiter - HDX is available in AAX format. It is a 64-bit plugin.

Which operating systems does it run on?

It runs on Windows and macOS. The listed requirements include macOS 10.13 High Sierra or later, with Intel and M1 Apple Silicon supported, and Windows 10 or later.

What do I need to use Oxford Limiter - HDX?

It requires Pro Tools 11 or above, using AAX Native or AAX DSP. It is intended for use with the DSPs of an Avid HDX system. Activation uses an iLok device (iLok2 or iLok3 with the latest drivers) or iLok Cloud, which requires an active internet connection.

Is there a sound quality difference between the HDX and Standard versions?

According to Sonnox, there is no difference in sound quality between the Standard and HDX versions. The HDX version is intended to move processing from the host processor to the Avid HDX DSPs.