[MLA] Apple seems to have turned Soundcheck ON by default...

[Ian Shepherd]

Confirmed, sadly - iPhone 11 with iOS 15.1 has pretty blatant DRC happening, monitored via a lightning-to-analogue converter. 

It’s pretty aggressive so I hesitate to call it limiting - here are the waveforms for Sound Check Off (top) and On, level-matched by ear:





This is about 1:30 into the first Track of “On Christmas Day” 😕

Ian




> On 19 Jan 2022, at 16:54, Ian Shepherd <ian at mastering-media.co.uk> wrote:
> 
> 
> Hi Bob,
>> Ian, in your copious free time
>> 
> You’re hilarious 😂
>> you should capture both ways. If you detect anything other than just a gain shift, then we should alert Buddy and maybe he can get that changed.
>> 
>> And in fact, if you can give me links to that choral music I'd like to check it and measure it
>> 
> 
> 
> It was one or other of these albums, possibly both:
> 
> https://music.apple.com/gb/album/hodie-an-english-christmas-collection-re-mastered/73233052 <https://music.apple.com/gb/album/hodie-an-english-christmas-collection-re-mastered/73233052>
> 
> https://music.apple.com/gb/album/on-christmas-day/695609721 <https://music.apple.com/gb/album/on-christmas-day/695609721>
> 
> (Both are beautiful BTW, although I prefer Britten’s Ceremony sung by a boys' choir rather than adults)
> 
> I just previewed the first track of “Hodie" and it has a +9 Sound Check value using iTunes in Mojave, which takes it to +0.1 dBFS @ 2:54 and sure enough it clips audibly, so no limiting in this case.
> 
> Ah hell, now I’m going to have to check it on iPhone…!
> 
> Ian

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