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.
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.
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.
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.).
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.
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.
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
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.