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| | #1 |
| Gear interested Join Date: Jul 2008 Location: Los Angeles
Posts: 12
| Waves L1 Weirdness and SR Recently we had to do a series of SR laybacks for a show mixed at the studio. The network spec asked the 5.1 be limited at -2 (The mixers didn't know about this spec till after the show was mixed and printed). So we plopped an L1 on the 6 discrete channels in Pro Tools for the layback. Everything looked good. The tapes went out to QC and failed, they were almost 3 db hot....Any ideas what went wrong? |
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| | #2 | |
| Lives for gear Join Date: Oct 2007 Location: Brussels but now Burbank
Posts: 780
| Quote:
Reread the QC, and tell us what was 3 dB hot. Maybe the dialnorm??
__________________ IMDB Five by Five Sound Now mixing "Kell On Earth" for Bravo. Upcoming: Top Chef Masters, Top Chef, Top Chef Just Deserts, Dance Your Ass Off, and Work Of Art. All Prime time slots | |
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| | #3 |
| Gear nut Join Date: Dec 2006 Location: DC
Posts: 107
| That doesn't make sense. I think you are confusing two problems. You say that QC rejected the shows for being 3dB too hot, but you don't specify what aspect is 3dB too hot. The VU, the Dialnorm, or the peak? I don't think it could be the peak because you stated that the peaks were limited at -2dB (dBFS I'd assume). 3dB above that doesn't exist, so the peak limit is not your problem. If it's the VU or Dialnorm your L1 probably wouldn't affect your VU or dialnorm that much (ymmv) unless you used some makeup gain. Problem 1) peaks need to be limited to -2dBfs. Solution: peak limiter with threshold of -2 and no makeup gain. Problem 2) VU or Dialnorm too hot. Soluton: Tweak the mix to get it in the pocket based on the spec. -Richard |
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| | #4 |
| Gear interested Join Date: Jul 2008 Location: Los Angeles
Posts: 12
| You're right. Its doesn't make sense. I was referring to the peak level and its only sneaking through on the center channel, While the L1 is set with the threshold at -2. Right, there is not 3db over -2. Maybe I wasn't clear, the 3db difference came from adjusting the L1 and checking it on a tektronix meter. The QC report just said "peaking." |
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| | #5 |
| Lives for gear Join Date: Oct 2007 Location: Brussels but now Burbank
Posts: 780
| Im thinking your electrical calibration on the D/A is off.
__________________ IMDB Five by Five Sound Now mixing "Kell On Earth" for Bravo. Upcoming: Top Chef Masters, Top Chef, Top Chef Just Deserts, Dance Your Ass Off, and Work Of Art. All Prime time slots |
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| | #6 |
| Gear nut Join Date: Feb 2004 Location: Auckland, New Zealand
Posts: 146
| You should set the L1 output to -2, and leave the threshold at -1. If you do it other way, L1 will add make-up gain. |
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| | #7 | |
| Lives for gear Join Date: Mar 2006 Location: the Netherlands
Posts: 1,050
| Quote:
You need to learn about all the different types of calibration and metering. If the network ask for -2 it could be -2 dB FS but it could also be -2 PPM or -2 Dialnorm or... If a spec from a network is not clear, call them before starting any work and make sure things are clarified. It will save you work in the long run. Alistair
__________________ -- Alistair Johnston Video & Film Post, Mastering, Sound Design | |
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| | #8 |
| Gear nut Join Date: Apr 2008 Location: Munich, Germany
Posts: 138
| The problem is of different nature. The HD SR you layed back on probably shows OVERS due to a metering issue Sony didn´t realize This can happen even when the Mix is limited at -2fs because the over indicator shows an interpolation of a clipped waveform. And yes still it doesn´t make sense but this is what Sony did there and now we all have to live with it unfortunately. |
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| | #9 |
| Gear nut Join Date: Apr 2009
Posts: 128
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