If your radio stream sounds steady at its source but shifts in YouTube, first check YouTube’s playback settings before changing your broadcast processing. YouTube can apply viewer-side audio enhancements, including Stable volume, while your station can separately measure and control its own loudness and peaks. Compare both points in the chain, then correct only the layer where the change occurs.
First identify where the volume change happens
Separate the station’s signal from YouTube’s playback. Listen to or meter the station output after its processing and encoder, then compare it with YouTube playback at a matched listening level. If both change, investigate the station chain. If only YouTube sounds different, inspect the player’s audio settings and the channel’s enhancement setting before adjusting the station’s processing.
YouTube says its audio enhancements may include automatic volume-level and sound-mixing adjustments, Stable volume to reduce differences between quiet and loud parts, and Voice boost to reduce background sound and highlight speech. These features are not applied to every video, and YouTube does not document one universal numeric mastering target for all videos. YouTube’s explanation of audio enhancements describes what may be applied.
Check YouTube’s playback controls
Stable volume
When available, Stable volume is on by default for viewers. It can be toggled in the YouTube player settings, but it is not available on every video and is off for YouTube Music and official music videos. Ask listeners reporting a change to check this setting; their playback may not match what the station sends. See YouTube Help on Stable volume and audio settings.
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Voice boost
Voice boost may be unavailable on some videos. When it is active, Stable volume turns off. This matters for radio mixes that combine speech, music, jingles, and other material: a listener’s selected treatment can change the perceived balance without any change in the station’s feed.
Channel enhancement setting
Channel owners can manage whether enhancements apply to future uploads in YouTube Studio. That control does not affect ads or videos already uploaded, and viewer accessibility settings may take precedence in some cases. Do not assume a channel setting overrides every viewer’s playback experience.
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Measure the station’s signal with the right loudness measures
Use a loudness meter that reports integrated loudness and true peak; monitor loudness range too when preserving dynamic contrast matters. Integrated loudness describes the programme’s average perceived level over time, while true peak helps identify peaks that may exceed the intended ceiling. They answer different questions: a programme can have a reasonable average and still need peak control.
For broadcast workflows where it is appropriate, the European Broadcasting Union’s EBU R 128, version 5.0 (November 2023), recommends an average programme loudness of -23 LUFS and use of Loudness Range and Maximum True Peak Level descriptors. Treat -23 LUFS as an EBU broadcast recommendation, not a universal YouTube target. The EBU’s R 128 Supplement 2, version 3 (November 2023) addresses loudness-based levelling for streaming and notes that streaming services typically use a higher target than broadcast standards. Delivery contexts should therefore be considered separately.
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EBU TECH 3401, version 2.0 (November 2023), covers loudness normalization and level control across radio production and distribution workflows, including metering, FM, Internet streaming, DAB, and media players. For broader Internet audio streaming and on-demand considerations, the Audio Engineering Society’s AESTD1008, version 1.21-9, published September 24, 2021, addresses loudness normalization, dynamic range management, metadata, peak control, and playback.
Choose normalization or live correction for the programme
File-based normalization for prepared material
When material is available as files before broadcast, measure and align those files as part of preparation. This lets you compare programme elements and transitions before they air, rather than relying on a live processor to react after a level difference has already reached listeners.
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Real-time correction for live feeds
For live content, real-time loudness-correction software or hardware can reduce level drift when file-based normalization is not possible. It cannot predict upcoming programme content, however, and may override intentional changes in loudness or dynamics. The AES guidance describes an analysis period of 30 seconds to two minutes as a typical balance between controlling average loudness and preserving natural dynamics; longer integration tends to sound more natural and produce fewer audible artifacts. These are guidance values, not a guarantee for every format or processor. Apply correction conservatively and listen for pumping or flattened contrast.
Peak limiting after gain changes
Because loudness correction may apply gain, use appropriate peak control and verify the result with a true-peak meter. A compressor or limiter can be part of a live-control chain, but it does not replace loudness measurement or careful setup. The AES overview of Internet audio loudness and peak control discusses these separate considerations.
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A practical setup and verification sequence
- Establish a baseline. Meter the station output after its processing and encoder. Record integrated loudness and true peak over representative programming; note loudness range if programme dynamics matter.
- Compare the two listening points. Listen to the station feed and YouTube playback at matched volume. Include speech, music, jingles, adverts, and transitions. If the source and encoder output are stable but YouTube differs, check YouTube’s player and channel enhancement controls before changing upstream levels.
- Correct source inconsistencies. Align source material, voice levels, transitions, and programme elements in the station chain. For prepared files, adjust them before broadcast where practical. For a live feed, use restrained real-time correction and preserve deliberate changes in dynamics.
- Set and verify peak protection. After any gain correction, check true peaks at the output and adjust peak control as needed. Do not use peak readings alone to judge whether quiet and loud programme sections are balanced.
- Listen through the full format. Compare speech, music, jingles, adverts, and transitions at matched playback volume. Check for pumping, unnatural shifts, or lost contrast, then verify again at the station output and in YouTube playback.
EBU guidance treats programme loudness and maximum true peak as distinct descriptors, and AES cautions that live correction has limits. The aim is a controlled station output that retains intentional dynamics—not an assumption that one numeric target will make every YouTube listener hear the same level.
Troubleshoot common volume problems
| What you hear | Likely place to check | What to do |
|---|---|---|
| YouTube playback differs, but the station output is steady | Viewer-side Stable volume, Voice boost, or channel enhancement behavior | Check the player settings and enhancement availability. Compare at matched listening volume before changing the station chain. |
| Voice, music, or transitions vary at the station output and in YouTube | Source material, transitions, or station-side processing | Measure integrated loudness and true peak, then align inconsistent elements upstream. |
| Level seems steady, but peaks become harsh or distorted after correction | Gain added by real-time correction without adequate peak control | Use appropriate peak limiting and verify with a true-peak meter. |
| The mix pumps or loses intended contrast | Overly aggressive or fast real-time correction | Reduce the correction, consider a longer analysis period, and recheck across representative programming. |
| Different listeners report different balance | Playback settings or feature availability may differ | Ask listeners to compare player settings, including Stable volume and Voice boost, and distinguish those reports from measurements of the station output. |
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