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4 part summing test
Old 6th August 2005
  #1
Gear Maniac
 
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4 part summing test

I wasn't really chomping at the bit to try this, but new my console order is like 3 weeks late so I have some time to kill. First, I built a passive summer last week, and for the most part, couldn't hear a difference, so I decided to do as close to a scientific test as I could think of.

Here are the condition's of the test:
First I used tracks from raw-tracks.com,
#1 because I think their service is really cool for begineers and because
it was done though 192's and tape originally, even though, this version was 16bit. (so shameless plug for them. http://raw-tracks.com
The track sheet details if you are interested in tape settings and
such.
http://www.raw-tracks.com/user/say_w...rack_sheet.PDF

Ok, in the following 4 files, each is the same mix. (split busses)

One is summed with a mystery mixer(not the one I built..)(three different kinds of d/a's, 5 stereo stems, each one painstakingly measured with a signal gen(at different freq's) to ensure that the a/d of the lavry (the lavry had both comp options on btw) had the exact same reading as the ITB summed digital output version of the lavry d/a's version which also went back into the same a/d(whew.)
I turned on the two options on the lavry a/d because I was worried about over handling (although I wasn't near) and because each mix had to have some way to switch back and foreth so I used my avocet for this. (So each analog summing stem did hit the avocet first before the a/d) again, everything was checked with a meter.
Now I added the 3rd file just for added wow factor, I randomly hit the switch button the avocet while doing a realtime export, it came out very nicely in that you really can't hear it click, but again, (you can't hear sqaut a difference it seems)

The 4th file, is of course the BTD. cause somebody was going to ask. So, this was a after thought actually, and I used cubase 3, so somethnig else I had to consider was delay compenstation and it was on, although, I don't seem to hear that it was wrong. analog it didn't matter and digitally it corrected..
so, with ITB I had to correct the gain. why?? because I had used the option's on the lavry and I partially had to do that because the gain on avocet was cranked to hit the top of the lavry. So this is the only variance here, so I eyeballed timeworks for a db or two of gain. This file had to had a few hundred miliseconds of silence added to line up with the realtime exports..
(whew)

Ok, shoot the test full of holes, but these things sound exactly the same to me, even know there's two different kinds of d/a's going to the summing mixer! can you pick them out? the both file is the one I'm switching on, between a lavry and back to the analog board.. if you can here the click..
If I screwed it up, even through my adam's it seems that they are so similar I don't think I'd waste d/a channels on just out's, but I sure as heck am not doing away with using insert loops with eq and exporting out and back in analog.

--Insert My cheesy saying here--
http://rockthemountain.com/~watkins/...mtest_both.mp3
http://rockthemountain.com/~watkins/...est_mystry.mp3
http://rockthemountain.com/~watkins/...l-sumtest2.mp3
http://rockthemountain.com/~watkins/...ll-sumtest.mp3
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