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iZotope RX Loudness Control

Mastering by iZotope

RX Loudness Control: Automatic Global Loudness Correction

Deliver transparent audio while meeting global broadcast specifications! RX Loudness Control works faster than real-time to ensure your audio mixes are delivered within the appropriate loudness standards. Designed specifically for audio/video post production and broadcast workflows, RX Loudness Control combines industry-leading, intelligent audio signal processing with an easy-to-use interface.

Efficiently analyze and render your mix to comply with any of the global loudness standards, then instantly create a .CSV loudness report. It's the best-sounding automatic loudness compliance processing available today—unparalleled in speed, accuracy, reliability, and sound quality.

Key Highlights

  • 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.
  • 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.

Intuitive Workflow

Render your audio to be loudness compliant and appropriate for delivery and broadcast—all with just two clicks! A history graph and loudness report inform you of whether your audio is within the appropriate tolerance of the selected loudness standard, and if not, shows you where the overflows may be occurring. An easy-to-use interface guides you seamlessly through the workflow, displaying relevant and useful loudness metering.

Surround Sound

Channel count formats vary from project to project, and loudness standards can dictate specs for surround channel counts. To ensure loudness compliance in any channel format you may be working with, RX Loudness Control supports mono, stereo, and surround channel counts up to 5.1 for seamless integration into any workflow.

IRC™ II Limiting

Existing automated loudness correction tools can sometimes produce questionable sound quality. Fortunately, RX Loudness Control includes IRC (Intelligent Release Control) II, an incredibly transparent limiting algorithm that sonically outperforms the competition. This offline process corrects a mono, stereo, or surround sound audio file for True Peak value (dBTP).

Global Loudness Standards

With so many loudness specifications being introduced and refined across the globe, it can be difficult to maintain loudness compliance for multiple broadcast networks. RX Loudness Control boasts an extensive list of the latest and most significant global loudness standards. Select from among the following loudness standards:

  • BS.1770-1 (Global)
  • BS.1770-2-3 (Global)
  • EBU R128 (Europe)
  • EBU R128 s1 (Europe)
  • AGCOM 219/09/CSP (Italy)
  • ATSC A/85 (U.S.)
  • OP-59 (Australia)
  • ARIB TR-B32 (Japan)

Multi-host Compatibility

RX Loudness Control supports offline processing as an AudioSuite plug-in for the two leading broadcast editing platforms: Avid Media Composer and Pro Tools 10-12. And for the first time, offline loudness-compliant processing is available as an audio extension for Adobe Premiere Pro.

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 and transparently 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 IRC™ 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 transparently 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

Will RX Loudness Control preserve the Left total/Right total (LtRt) encoding on a Dolby-encoded LtRt mix?

  • Yes, RX Loudness Control will fully preserve your Dolby LtRt mix. Because the gain is applied consistently across all channels, the phase relationships and panning angles of your LtRt mix will be maintained.

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 currently compatible as plug-ins for Pro Tools 10-12, Media Composer 7-8, and Premiere Pro CC. Additional host support is under development. 

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