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Re: Hi Alex, thanks for the very level-headed response

one question i have is that your graphs consistently show what appears to be higher relative dynamics in the m-ch versions compared to the stereo versions and you seem to be implying that in your text.

can you confirm this is so? have you also compared the difference between Maximum RMS - Average RMS across the various recordings (using the statistics function of adobe audition) and do they also support the hypothesis of higher relative dynamics?

Take a look at figure 6 in the article:

http://www.ixbt.com/dvd/sacd-dvd-a/fig6.png

The statistics you're interested in seem to indicate slightly greater dynamics from the stereo tracks (right hand side) but it's not clear whether the statistics are for a whole track or just a sample. I assume a whole track since it's clearly not just for the brief sample shown in the traces at the bottom.

*if* the original masters are at 44.1 or 48 kHz sampling, then the ultrasonics in the m-ch tracks can also be explained by processing done during the surround remix (for example, digital reverb).

Nope. Take a look again at Hourglass multichannel track data that Alex took from the outputs of the 47Ai:

http://www.ixbt.com/dvd/sacd-dvd-a/fig4.png

http://members.cox.net/alex_lat/Tests/Taylor-2.PNG

No unexpected ultrasonics are present except in the data taken from the 49TXi. I'm not sure how I could make this point any more clear...

Dave

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