I still don't get it. " -9dBdFS = 0dB analog"

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Frank Haas
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2010/02/23 09:43:16 (permalink)

I still don't get it. " -9dBdFS = 0dB analog"

just had a little discussion.
I told the mixing engeneer to increase the digital level from -10dB to -5dB.
He told me he wouldn't do it cause it would override the mixer.. "-10dB is 0dB analog!"
I told him that I know about that formula, but the level is too low.. we need to increase the level by 5dB, I also told him that we have 10dB of digital headroom and if he thinks that we can't use that headroom !?
again he confronted me with his same answer..
We are using a Yamaha 01V96, a separate digital peakmeter (the red area begins at -9dB (ending at 0dB of course))
the signal is fully digital as far as I know..
after he had to increase the level and I had my "volume", no clippings.. nothing..
so what is the problem about the "-9dBdFS vs. 0dB analog" ?
thx
frank
post edited by Frank Haas - 2010/02/23 09:44:36
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    D.J. ESPO
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    Re:I still don't get it. " -9dBdFS = 0dB analog" 2010/02/23 12:50:45 (permalink)
    http://www.independentrecording.net/irn/resources/metergain/index.htm
     
     
     
     
     
     
     
     
     
     
     
     
     
    "
    Unfortunately there is no definitive standard of conversion in ADCs for converting from dBu to dBFS; it varies from brand to brand, model to model, even country to country. A pro-grade line level of +4dBu can typically equate to anywhere from - 12dBFS to - 20dBFS on the digital scale, depending on the individual ADC's calibration. Some ADCs even have switches on them offering multiple calibration settings.
    There are many quality ADCs that convert +4dBu to -18dBFS as a default. For this reason, this is what many engineers quote as the conversion factor, and it is also the default display setting for our meter on the left. But the number of ADCs that do or can equate +4dBu to a different digital level than that are at least as numerous as those that equate it  to - 18dBFS, so we need to check the specs on our ADCs to ensure we are using the right calibration standard for our recording."
     
     
     
    It  seems like your guy is  being a little stubborn . Or his console has some unusual specs!
    post edited by D.J. ESPO - 2010/02/23 12:58:17
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