[MLA] Loudness example with distortion on Sound Check

[Kevin Gross]

dBTP is the short answer there. All is good, that's what that meter was
designed for. Does anyone still use dBFS metering?

Kevin Gross - AVA Networks


On Tue, Oct 16, 2018 at 3:41 AM Ian Shepherd <ian at mastering-media.co.uk>
wrote:

>
> Hi Kevin,
>
> > Intersample clipping is rarely audible as clipping but it is distortion
> and it manifests differently in different playback systems. Are you basing
> your "intersample safe" claim on your ears or on a dBTP meter?
>
> I’ve been mastering to -1 dBTP for years now, and telling my clients the
> results will be suitable for online delivery. When I read the Spotify
> recommendation of -2 dBTP for uploads (which they’ve now updated to -1
> unless the loudness exceeds -14 LUFS) I pulled up a couple of recent albums
> I’ve worked on from Spotify to make sure I hadn’t missed something.
>
> Post-decode (and without normalisation) the loudest albums still measure
> below 0 dBTP, which as I understand it means there will be no additional
> clipping distortion (or limiting) at the decoder. They certainly sound fine.
>
> Of course this is all program-dependent, and especially depends on the
> codec data-rate, but just as I don’t master for earbuds, I’m not planning
> to compromise my work for super-low data rates, unless a client
> specifically asks me to.
>
> My main concern was to make sure that the -1 dBTP max “rule of thumb” that
> I offer people was still reasonable advice (assuming sane LUFS levels) and
> this reassured me that it is. Since the loudest material on the albums was
> above -14 LUFS, I think it’s reasonable to say that in most cases, -14 LUFS
> material won’t introduce “problematic" ISPs.
>
> Hope that makes sense,
>
> Ian
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