RX Loudness Control: Easy Audio Control for Video Editors


With the widespread adoption of loudness standards in broadcast territories worldwide, video editors now have a new criteria to keep in mind when delivering content: loudness compliance.

Loudness standards require audio levels within a program to stay within a specified range, in order to provide the viewer with a more consistent and pleasant listening experience.

But it's about more than just having a program "sound good." Broadcasters risk significant fines and penalties, so they will refuse to air your mix if it does not meet the required specs.

Compliance explained

When clients tell you that your mix doesn't comply, what they mean is that the audio levels are outside the acceptable range as defined by the loudness standard used in that territory.

This means that they could be above or below the acceptable LKFS level, above the acceptable True Peak level, or above the acceptable Short Term level.

These are all different kinds of measurements of level that can be monitored using specialized loudness meters (such the level meters in Insight, shown below).


Yet new standards are constantly being introduced, and existing standards refined. This results in a lot of moving targets. And in addition to keeping eyes on the levels, you'll likely need to create different mixes if you're delivering to multiple territories.

For video editors not accustomed to dealing with audio in such detail, this issue can be intimidating, to say the least. It's a lot of new technical know-how to keep in mind while preparing your content for delivery... where do you even begin?

Global loudness solution

Learning how to read all of the different meters can feel daunting. Fortunately, you don't need to be an audio expert to make compliant content. iZotope's loudness plug-in offers a quick, simple-to-use solution.

With RX Loudness Control, loudness correction is as simple as loading a preset and rendering. Automatic and transparent loudness correction is applied to your audio to meet global specifications, so you can confidently deliver content anywhere in the world, knowing that your audio is within spec.

RX Loudness Control takes your existing audio mix (mono, stereo, or up to 5.1 surround) and performs the necessary changes to your mix to meet global specifications. This includes a single unified gain adjustment for LKFS, mastering-grade limiting for True Peak, and, when required by certain standards, transparent RMS compression for Short Term. (The transparent processing retains the dynamics of your mix, so your audio still sounds how want you want it to.)

And if you're delivering to multiple territories, you can access presets for all major loudness standards including BS.1770-2/3 and the new EBU R128 s1 standard in Europe.

Here's an example of "before and after" processing with RX Loudness Control:


What this all means is that you can focus on delivering great content—without having to keep all these measurements in mind.

Two-click compliance

Keeping up to date on the differences between standards is work enough. With RX Loudness Control, it takes just one click to render and one click to comply.

All you need to do is pull up the appropriate preset for your desired standard, render your mix, and repeat for the next territory. And since it can process an entire hour of audio in under a minute, it can save huge amounts of time.

With a streamlined interface and intuitive tools, there's virtually no learning curve for video editors who aren't used to dealing with audio.

RX Loudness control supports Adobe Premiere Pro CC, Avid Pro Tools, and Avid Media Composer workflows. You can even export a .CSV loudness report for delivery to your network to prove compliance.

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