John,
We are seeing the same thing here at Frontline. Avid did something in the 6.x release. We started outputting shows and our mono's were wrong. Found that we had to use 3db on mono sums. The math is wrong but the meters are right. I have to go with the meters (and my ears) because that is what we get tech eval'd on.
Tim Mangini
--- In Avid-L2@yahoogroups.com, "johnrobmoore" wrote:
>
> Well something is up. I made 2 tracks of Avid 1K -20 db tone just like always and then did a mono mixdown of those two tracks to Channel 3. It then plays back 3 db hot. If I set the audio mixer to -3db for channel 3 it is correct. As far as where the channels go I'm doing this all in Avid using the Avid audio meters and I'm in direct mode so there is no routing out of avid in this case it is all internal. I did find in the audio project settings a Dissolve midpoint attenuation setting that is "Linear -6db" the other choice is "Const Power -3db". I don't see how or why that setting would effect an internal summing of channels for an audio mixdown. This just seems wrong or Avid changed the math for mixdowns.
>
> --- In Avid-L2@yahoogroups.com, Brandon Howlett wrote:
> >
> > When you test it, make sure channel 2 only goes out channel 2. If it's still -23 something else is up. Good luck
> >
> > Sent from my iPhone
> >
> > On Jan 18, 2013, at 5:04 PM, "johnrobmoore" wrote:
> >
> > > Well that jives with my past knowledge and experience. Here's exactly what I've done. I put the stereo SFX stems on tracks 5 and 6. I then do a mono mixdown of them to Audio Channel 2. Now when I play back the avid after deleting the tracks 5 and 6 in direct out the channel 2 track plays at -23db when I set the mixer for that channel to -6db. Setting the channel to -3db does the trick to get it to -20 proper tone level. This has not been my experience in the past and I agree with you but empirical data from today is different. I'm going to recreate this just to see if I did something of a bone head nature. It has been a very long week and it's only Friday. ;-(
> > >
> > > --- In Avid-L2@yahoogroups.com, brandon howlett wrote:
> > > >
> > > > Hi John,
> > > > Not sure exactly what is going on. I'm a re-recording mixer and I've made thousands of mono stems. -6 dB is the correct setting for this. If you are seeing -23 dB on your dBFS meters, then you are looking at the result of your mono stem being panned to the left and the right channels. The correct way to check your stem is to bus the mono stem to both the left and right channels independently. Do not pan the mono stem to the left and right channels. The result will be an attenuation of the audio signal the amount of the pan law, which is variable in pro tools version 9 and up. Let me know if you need any additional information.
> > > > Best,
> > > > Brandon Howlett
> > > > Brandonx1@
> > > >
> > > >
> > > > ________________________________
> > > > From: John Moore
> > > > To: Avid L2
> > > > Sent: Friday, January 18, 2013 3:31 PM
> > > > Subject: [Avid-L2] Audio mixdown of stereo tracks to Mono -6db or -3db?
> > > >
> > > >
> > > >
> > > > I've posted about this before but in my experience and understanding when I take a pair of stereo tracks like music or EFX and do a mono mixdown to create a mono stem I set the audio mixer to -6db to account for the doubling up of the tracks. This is the math and approach I've used successfully in the past. Today I took a stereo EFX pair and mixed down to mono and when I set it to -6db the tone section at the head is playing back at -3db below the standard -20 for reference tone. WTF? Has the audio mixdown matrix changed in V 6? I seem to recall there are some audio settings to do with how much attenuation in a cross fade or pan senario. Do these controls effect a mono multing in an audio mixdown? I'm confused -6db has always worked and I've had my protools mixers confirm that is the proper setting. What am I missing here? Why is -3db now seem to be the magic number? Is tone fooling me?
> > > >
> > > > John Moore
> > > >
> > > > Barking Trout Productions
> > > >
> > > > Studio City, CA
> > > >
> > > > bigfish@
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
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