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iZotope RX Loudness Control Educational




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RX Loudness Control 

Deliver great-sounding audio for broadcast while ensuring your content is delivered within the appropriate loudness control standards with RX Loudness Control! Designed specifically for post production and video editors' workflows, RX Loudness Control combines industry-leading, intelligent audio signal processing with an easy-to-use interface.

Efficiently analyze and render a file for loudness compliance in faster than real-time, then instantly create a .CSV loudness report. It's the fastest, most reliable way to get the best-sounding automatic loudness compliance processing available today.


izotope rx loudness control overview



Ensure your mixes meet the required delivery specifications with truly intelligent algorithms that take out the guesswork.

Deliver results globally with a single product offering the latest, greatest, loudness standards—no matter where your content is being delivered.

Produce more content than ever with extensive presets, a curated featureset, and a fast, efficient workflow that saves you time on the final stage of TV production.


RX Loudness Control System Requirements

Operating system requirements:

RX Loudness Control runs as a plug-in for your video or audio editing software.

Windows: 7 or later
Mac: OS X 10.7 or later (Intel only)

Plug-in formats:

Audiosuite DPM & AAX, Adobe Extension for Premiere Pro CC, and Adobe Extension for Media Encoder CC.

Host compatibility:

RX Loudness Control is compatible as plug-ins for popular hosts Pro Tools 10-12, Media Composer 7-8, and Premiere Pro CC.


Technical FAQs

How does RX Loudness Control process multiple channels of audio?

RX Loudness Control applies the same gain envelope (linked operation) to all channels—for example, stereo and 5.1 surround—to maintain phase and balance between the different channels in the final mix file.

How does RX Loudness Control comply with different loudness standards?

RX Loudness Control first analyzes the audio source file. Then it computes the amount of
transparent correction required to hit the target without a perceived change to the dynamic range. The correction pass includes three elements:


A fixed amount of gain to hit the specified integrated loudness

[optional] An RMS compressor to limit the Short-term (or Momentary) loudness

A True Peak limiter

Steps 2 and 3 work only on an as-needed basis. If the audio signal already meets Short-term
and True Peak specs, no extra processing is applied.

How does RX Loudness Control use compression?

RX Loudness Control uses compression in a way that preserves the quality of your audio. When needed, a compressor dynamically adjusts your audio to ensure you get the best sound while remaining compliant. For loudness standards that require Short-term or Momentary compliance, the compressor is engaged automatically when loudness exceeds the specified target. You simply enable a slider via an on/off button and set the threshold. The Short-term/Momentary slider toggles between both modes, and can be turned on or off.

How will the processing affect the dynamics of my mix?

For many mixes, dynamics are not affected at all. This is because only a fixed gain is required to meet the spec. However, if your mix is too dynamic or has significant transients, compression and/or limiting are required to meet Short-term (Momentary) or True Peak parts of the spec. This reduces the dynamics of the mix in the same manner as a compressor and/or iZotope's IRCTM II limiter (also found in iZotope's creative mastering platform, Ozone 6.).

Can my audio distort if my peaks are higher than the True Peak setting?

IRC II is considered one of the best limiting algorithms. Its goal is to provide the best possible sound during operation. For most mixes, it will only work occasionally to meet the loudness spec. If the limiter is being hit hard, it might be that the mix is too dynamic and needs to be redone or compressed prior to loudness correction.

What's the difference between RX Loudness Control and iZotope's Insight?

RX Loudness Control and Insight complement each other in post and broadcast workflows. Insight is a surround sound, real-time loudness metering suite that helps you visualize changes made during mixing and mastering. RX Loudness Control is a more comprehensive tool that analyzes and corrects your final render for compliance with global loudness standards.

What is the difference between RX Loudness Control and the Loudness module in RX 4?

RX Loudness Control includes several updates and enhancements that make it a more comprehensive tool than the Loudness module in RX. These include the following:

Generate a loudness report in .CSV

Supports surround sound, up to 5.1

Available on the Adobe CC platform and as an Audiosuite DPM/AAX plug-in

New, faster loudness algorithm (still with industry-leading accuracy)

Supports the EBU R128 s1 standard
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