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#111
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Re: UPDATED Room Calibration for Film and TV Post
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Jonathan S. Abrams, CEA, CEV, CBNT Apple Certified - Technical Coordinator (v10.5), Support Professional (v10.6 through v10.10) |
#112
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Re: UPDATED Room Calibration for Film and TV Post
Chief,
Funkcity will post his findings here and we'll see what's up.
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Marti D. Humphrey CAS aka dr.sound www.thedubstage.com IMDB http://www.imdb.com/name/nm0401937/ Like everything in life, there are no guarantees just opportunities. |
#113
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Re: UPDATED Room Calibration for Film and TV Post
I have found that the Tascam's filtered pink is way off, it seems like they simply applied the filter but did not adjust to make up for the resulting power loss. An SPL meter therefore does not read correctly. I never thought to check it before! The unfiltered, though, is what I expect it to be.
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Call me by my real name, "Postman" |
#114
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Re: UPDATED Room Calibration for Film and TV Post
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Jonathan S. Abrams, CEA, CEV, CBNT Apple Certified - Technical Coordinator (v10.5), Support Professional (v10.6 through v10.10) |
#115
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Re: UPDATED Room Calibration for Film and TV Post
Maybe. The difference seemed to be about 7.5 db, much worse than I had remembered and so I've edited this post.
Perhaps you should download those bluesky test files. As far as I can tell they are pretty much on the money. Compared to the -20dbfs setup tone, the full bandwidth noise measures .7db low on my RMS RTA, but I believe it is because the full noise was actually hi-passed around 40hz. The bottom octave, if it were present, would make up the difference. The band limited noise is, I believe, on the money. The LFE setup noise is also hi passed at 40, and it also measures .7db low on my equipment. That half db is nothing to worry about in my opinion.
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Call me by my real name, "Postman" |
#116
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Re: UPDATED Room Calibration for Film and TV Post
Pink in the Tascam DSM 7.1 is incorrect but there is an IC firmware replacement you can order from tascam to fix the problem. After lamenting over this issue with another colleague it was the only solution we could find. It turns out it was another problem that made the pink unusable, contact tascam. In addition to that, Digi's pink is unusable upon rta analysis as well. I would be more inclined to use dolbys pink or find "god pink" if it is available to you. Calibration cds are a serious problem unless you cal to -10 or you have a balanced cd/dvd player. It might work on a theater A chain but not in a +4 environment. AC3 encoded material is compressed very compressed the only way you can acheive this is using DSD or DVD A standard mlp encoded or strict pcm encoded cal material.
No debate here just some help on the tascam issue and potential nightmare caling consumer playback gear. Remember most commercial dvds are being remixed and hyped for nearfield consumer environments,cal being 80db to make an even hotter mix. A question for FUNKCITY... "It is for TV, DVD: -20 dBFS = 0VU = +4 dBu = 85 dBC SPL for L,C,R,LS,RS and on a Real Time Analyzer 10 dB of inband gain above the center channel from 20 ~ 30 hz to 120 hz" How did you arrive at this figure for TV calibration? And why would you induce low frequency gain? When base management is going to extrapolate from all 100hz and < material and stear it to the lfe? This calibration methode makes no sense to me. -ws
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Will S AUDIOSFX |
#117
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Re: UPDATED Room Calibration for Film and TV Post
The full band pink noise coming from my DSM7.1 is correct according to my IVIE IE-33 (not a "lab grade" instument but good enough for audio work)! It matches two other pink noise sources I have here and is in agreement with Dolby's -20 noise, both in terms of level and frequency spectrum. Okay, the truth is there is a slight rise above 10Khz, which is nearly eliminated if you run the box at 96Khz (double clock'd 48k). The rise is about +1 at 20Khz. This was measured on an analog output, I suspect the digital output is okay. The band limited noise is at a wrong level, by a lot, and I have edited my previous post to correct my inaccurate statements. I will investigate whether there is firmware upgrade to correct it.
Digi's pink is a little unusual on both accounts. The level is 2.5db too much, and the amount of power in some of the frequency bands looks a bit off, with 1 to 1.5 db dips around 250hz and 8khz. The dips are very smooth and very broad, and gives the imaginary "straight line" response more of a gentle wave shape. Since most speaker systems and rooms are far worse than that, I don't think it would be a serious problem to set up a room with it, if nothing else was available, as long as you accounted for the level problem. But, it is not perfect.
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Call me by my real name, "Postman" |
#118
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Re: UPDATED Room Calibration for Film and TV Post
I have a Dolby Set up Protools session, offered at no charge by dolby here in NYC. It has everything you need to calibrate and test with in a protool session for 5.1.. If you need it send me an email and i'll burn a copy of the session for you. I use it with Dolby everytime we printmaster.... I've never used my DSM 7.1 pink to calibrate , but now i'm going to test it to see if it matches Dolby's pink or not....
cheers georgia
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georgia hilton CAS MPSE MPE Hilton Media Management Film Doctors http://www.filmdoctors.com Me... http://georgiahilton.webs.com/ Stage 32 http://www.stage32.com/profile/6569/georgia-hilton My Production Company http://www.hiltonmm.com CREDITS (partial) http://www.imdb.com/name/nm0385255/resume MEMBER: IATSE LOCAL 700 |
#119
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Re: UPDATED Room Calibration for Film and TV Post
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Also for TV broadcast if I calibrate my room to -20 = 0VU=79dbSPL, there is no way I can listen to narration at anywhere near 0VU, again it is way too loud. I have to turn the monitors down about 10db for a comfortable listening level. TIA, jim |
#120
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Re: UPDATED Room Calibration for Film and TV Post
Yes, Jim, they are being "remastered". Some do it in a "living room", some put an L2 and push it to
And, I also got confused with funkcity's recommendation for TV/DVD. Was he referring to "HDTV and DVD 5.1 mixes"?
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A job's not done until it's ready, or the producer is breaking down the studio's door... |
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