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Spotify Mastering Algorithms

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Spotify Mastering Algorithms

Postby CaptainBAM » Sun Jul 28, 2019 11:43 pm

Hey guys,
The Loudness Penalty Website (they also offer plugins, not only the website service) states: "Spotify does lift the level of songs with positive LP scores though, so if your track had scored LP +3 (a positive value), its playback level would be increased by 3 dB."

Wouldn't that mean, that if I have a track with around -18LUFS loudness, but peaks to around -0,1 dB truepeak, that Spotify would need to limit/compress my peaks, so that they can increase the overall volume, so my loudness matches their target loudness? Or is Spotify increasing my loudness without touching the peaks? This would be crazy also, since my peaks would be clipping then, since they only increase the volume for a higher loudness, by not compressing it.
I'm confused to some extent. Please help me :D

Kind regards,
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Re: Spotify Mastering Algorithms

Postby CaptainBAM » Mon Jul 29, 2019 1:24 am

I just found:
"Positive gain is applied to softer masters so that the loudness level is at ca - 14 dB LUFS. A limiter is also applied, set to engage at -1 dB (sample values), with a 5 ms attack time and a 100 ms decay time. This will prevent any distortion or clipping from soft but dynamic tracks."

quite interesting!
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Re: Spotify Mastering Algorithms

Postby blinddrew » Mon Jul 29, 2019 9:24 am

I don't think they'll lift anything into clipping, but if you're mastering for lossy compression formats it's always good to aim for about -3dB true peak to make sure no artefacts are introduced when it's compressed to mp3 or whatever.
This also gives headroom for those platforms that do turn up as well as down to do so.

But i could be wrong, these things are updated fairly frequently, they might just stick a peak limiter on as well.
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