DigitalMusicProduction wrote:That entirely answers the question.
Out of interest is there a comparison between dBFS and LUFS ? Example what would -18dBFS equivalate to in -LUFS ?
No, because they are fundamentally different things. It's that fundamentals
word again... and an absent understanding of fundamentals like this is where you keep tripping up.
dBFS is an measurement of the instantaneous signal amplitude
measured in decibels relative to peak digital level (hence the suffix, FS which stands for 'full scale').
LUFS is a measurement of the perceived loudness of a programme integrated over time
. It is measured in Loudness Units relative to digital full scale -- hence the acronym LUFS*.
While they both broadly measure the size
of the signal, they each measure that size in a very different way, and they also do it in very different time dimensions. So there is no equivalence whatsoever.
*For the benefit of our American friends, this loudness measurement is denoted with LKFS which refers to Loudness (units) with a K-weighting filter, relative to (digital) full scale.
LKFS and LUFS are completely equivalent. The LKFS term came first from the ITU-R BS1770 standard, but it was subsequently renamed in Europe to make it 'more friendly' to end users as LUFS (pronounced 'luffs').