Perceived loudness - Match Volume

Hey,
I'm trying to match the volume of a large amount of small mono wav files.
I would like to use the perceived loudness setting but the Match Volume function dosen't seem to work properly with it. E.g. when there are files in my pool that vary from -25 dB to -11 dB and I use the match volume setting to match the perceived loudness to -17 dB the output volumes vary from -21 to -12 but don't seem to have the exact volume of -17 dB (which is the case when matching the RMS).
And a question what does perceived loudness really mean? I know that it is more sensitive to the mid-range, but is there any graph that shows how it exactly works?

Muks85 wrote:
Relly You can match the volume of 6000 files by ear better than an automated process? I'd like to see that:)
Yes I can match files better by ear. No, I wouldn't do 6000 of them like that, obviously.
In my opinion a 'Match volume' level should first measure what energy a signal has e.g. RMS than calculate how many dB should it add or remove to match the desired level. Simple as that. The more complicated the measurement is the more complex is the whole match function.
So when I use percieved loudness to match the volume of 6000 files, Audition should first estimate the loudness of all the files and that apply gain to them to match my desired percieved loudness level. That's how it works with e.g. ITU norm.
Well that is pretty much what I said - except that it's not a simple measurement at all, otherwise it would have been commonplace a long time ago. For a start, as well as dynamics changes, perceived loudness is very much frequency-dependent, so weighting algorithms have to be used. But like you said, 'estimate' is about it.
Oh, and some of the regularly broadcast antics of one of the largest broadcasters in the world (the BBC) prove conclusively that the EBU/ITU way of doing this simply doesn't work, FWIW. One of the single biggest culprits is speech vs. music or general output on TV. If it did work, I wouldn't have to turn up the sound on nearly every speech programme they broadcast, but I do - and I'm not alone. Like I said, I can guess it better than any automated system.

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Perceived loudness - Match Volume

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