[MLA] Loudness example with distortion on Sound Check

[Thomas Lund]

Hi Bob,

That’s still an excellent example, and points to the danger of allowing positive gain, especially when having a bad limiter in the system.

cheers,
Thomas




> On 13 Oct 2018, at 18.21, Robert Ludwig <gatewaybob at mac.com> wrote:
> 
> Hi Ian,
> 
> As you like to write about Loudness I wanted to give you something I came across before you joined the group.
> 
> We were once on the lookout for real world examples of tracks that needed boosting on iTunes Sound Check and that boosting would cause distortion I came across this example in my iTunes library.
> 
> Attached is a 5:26 Victoria Mullova & Kristian Beuldenhout Beethoven Violin Sonata movement on iTunes that peaks at -2.8 dBFS on the left channel at 4:26 on the 3 loud chords.  
> 
> Sound Check says it needs to be raised to +8.8dB!  It technically has 6dB of distortion at that peak if Sound Check was being used.
> 
> BS-1770 says it has a Program Loudness of -27.7, so if iTunes had used ITU as a measurement it would have raised it even more!
> 
> Best,
> 
> Bob Ludwig
> 
> 
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