Here are the settings from Spectrafoo, just so you know. I was primarily interested in audible differences which is why the parameters are set so high. I only compared mixes that were easily audibly different. The charts below are spectragraph charts of only the difference signal, when compared to Mix file 24. All of the charts below were made with these exact same settings.
NOTE: These screen shots were taken before I discovered the defective plugin that was adding a -132 bump below 96 Hz. Since the screen resolution is much higher than -132, I do not know that it would effect what you see here, but I thought I should mention it anyway.
One thing I noticed about the SSL mix was that it seemed to have more low end, primarily below 80 Hz. There was also a crispy thing going on in the top end. The graph below confirmed both these observations.
The Oxford mix also revealed something very different from the SSL, yet clearly the difference signal is frequency dependent. See below.
Here's the chart on the Dangerous 2 Bus below. Notice that there is almost no difference in the 250 Hz region. Why, you might wonder? I sure do.
And the Pultec mix showed a substantial difference. The comb filtering that is so obvious below (as curved cascading stripes) is a result of slightly different sampling freqencies in the AD and DA.
The difference signal of the Trident shows a different type of sampling frequency discrepancy. If you've listened to the difference signal, you know what I mean. The vertical stripes where the level is the loudest is when the difference signal is the greatest, due to Fs differences.
And lastly, here's the Yamaha 2000 analog mix below.
What do you think of these differences?
I think the difference in the SSL and Oxford mixes are the most interesting. Why is there a difference in the frequency response? And the D2B, why is there such a difference everywhere except in the 250 Hz region? Interesting to say the least.
[ May 07, 2003: Message edited by: 3D Audio Inc. ]
[ May 09, 2003: Message edited by: 3D Audio Inc. ]