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A Very Basic Levels Question


Alex C

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Hello All,

BRAND new to the forum here. It was nice to find such a good audio resource.

So I'm fairly new to the audio eng gig. I did editing for a shop in Portland for about 6 months before their audio guy moved away. I let it slip that I'd been playing music my whole life, which I guess equates to me being the new audio guy. I was more than glad to oblige, and am really enjoying it so far. I, however, was given a very 101 basic training on our specific audio bag, and have very little knowledge outside.

MY QUESTION WITHOUT THE BACKSTORY: I'll be mixing on a 552 direct to RED, and I don't know where my tone levels should be landing on the 552, or the RED.

Any help is much appreciated.

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Hello All,

BRAND new to the forum here. It was nice to find such a good audio resource.

So I'm fairly new to the audio eng gig. I did editing for a shop in Portland for about 6 months before their audio guy moved away. I let it slip that I'd been playing music my whole life, which I guess equates to me being the new audio guy. I was more than glad to oblige, and am really enjoying it so far. I, however, was given a very 101 basic training on our specific audio bag, and have very little knowledge outside.

MY QUESTION WITHOUT THE BACKSTORY: I'll be mixing on a 552 direct to RED, and I don't know where my tone levels should be landing on the 552, or the RED.

Any help is much appreciated.

Welcome Alex,

  We will give the Senator the evening off.....

There is plenty of this information on this site. Do a search and you will find plenty of information on level settings for the 552 and especially the RED ....

Good luck...

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-20db is the usual line up between recorder and camera. But that is a basic guess. I would look up the specifics of your gear n camera. Always record a good mix to your recorder. Cover your ass w such a recording. Good luck.

CrewC

Roger all that, especially w/ the RED.  Ignore the RED's meter markings and set your ref tone around mid-scale.

phil p

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For the purposes of matching devices with full scale peak meters (like the Sound Devices and the Red, the line up tone is too often needlessly made complex.

The fact is that it doesn't matter what numerical value you use in this case, as long as it is the same on both devices (in this case the Sound Devices 552 and the Red camera. For example, if there is a tone on the 552 at -10, then the same tone should line up at -10 on the recorder, and then the recorder and mixer are properly lined up.

-20 is the accepted standard for the 0VU reference for recording original dialog tracks, which is why we usually use this level of tone, but this is not what we're talking about when aligning the SD-552 and the Red.

Glen Trew

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Not really related to levels but just remember that if you're also recording to the the 552, it records at 30fps as a default without any way of altering the fps rate internally (unless you're being fed time code externally) so if you're working without time code, you'll have to edit the meta data afterwards. Not an issue if the RED is also running at 30fps but if not then you'll have sync issues (fixed in seconds using Wave Agent!).

Good luck with everything.

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With the latest firmware update, 1.2, the 552 no longer defaults to 30fps. If no tc input exists then the 552 just stamps time-of-day.

change - in the absence of a time code signal, timecode  & speed related metadata is not written. This is to prevent Final  Cut Pro from introducing unintended sound file speed changes.      The 552 continues to write the time-of-day value as a start time  code stamp in bEXT when when time code is absent.

http://www.sounddevices.com/download/552-firmware.htm

Bob

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So I guess there's something I'm missing... For some reason a hard concept for me to latch on to.

When I'm micing someone on set, and they're just speaking their lines, where should they be hitting on my scale? -20db? or is that just where I should aim for ref tone to the red?

I'm sorry this isn't clicking like I'd hope.

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" is that just where I should aim for ref tone to the red? "

yes!

on digital meters (which end at 0dBFS) the 0dB represents all bits on, and a brick wall maximum level.

on analog type meters (including lights/bars), the "0" value is more towards the middle of the scale, with clipping at some value like +22.  tone at -20dBFS on a digital meter is about the same as tone set at 0 db on analog type meters, both having around 20dB of "headroom" over the lineup tone.

but don't waste all 20 dB of headroom. voice peaks are way too fast for mechanical (real) meters, but on faster responding types of meters, it is OK to get to around 8 dB away from the "wall". on peaks  I tell my students to keep the meter bouncing in the middle 1/3 of the range. too low, and the s/n ratio is poor, too high and an unexpected peak will hit the wall...

Jay Rose has excellent books covering the stuff you are asking: www.dplay.com

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" is that just where I should aim for ref tone to the red? "

yes!

on digital meters (which end at 0dBFS) the 0dB represents all bits on, and a brick wall maximum level.

on analog type meters (including lights/bars), the "0" value is more towards the middle of the scale, with clipping at some value like +22.  tone at -20dBFS on a digital meter is about the same as tone set at 0 db on analog type meters, both having around 20dB of "headroom" over the lineup tone.

but don't waste all 20 dB of headroom. voice peaks are way too fast for mechanical (real) meters, but on faster responding types of meters, it is OK to get to around 8 dB away from the "wall". on peaks  I tell my students to keep the meter bouncing in the middle 1/3 of the range. too low, and the s/n ratio is poor, too high and an unexpected peak will hit the wall...

Jay Rose has excellent books covering the stuff you are asking: www.dplay.com

I think something just clicked. See? --> *click*

So on the 552 (which sports a digital meter), I'll be running -20db tone, and my dialogue in the range -20db to around -8db, as to not get to close to the brick wall, which on a digital meter is 0db.

So why on Earth did the Audio Gods choose 0db for digital to be a max, and 0db for analog to be middle range?

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" The internet is my school. "

it is a good thing there is nothing but correct information on the internet!

Experience keeps a dear school, and some will learn from no other.

you are going to have to go to that school!

I definitely am trying. It's a lot of info, (dumptruck amount) to take in when you're kind of thrown into a one-man department like I have. I'm playing 3 roles essentially and need any help I can get =)

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<< and I don't know where my tone levels should be landing on the 552, or the RED.>>

how come you don't know where the tone levels should be landing on the 552 - which is where the tone is being generated?

it's another thing as to how and where the level should be on the red, when fed with the tone from the 552.

dude, check it out - somewhere where you can... internet or otherwise...

good luck with your shoot.

-vin

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Not sure if it was explained simply in all the replys. Tone from your mixer should be at "0", all digital recorders downstream should be set at -20dbfs assuming they have some type of metering scale. If you keep the levels on your mixer between -20 and -10 you'll be fine. Also remember that line level out to line level in and mic level out to mic level in.

Eric

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Not sure if it was explained simply in all the replys. Tone from your mixer should be at "0", all digital recorders downstream should be set at -20dbfs assuming they have some type of metering scale. If you keep the levels on your mixer between -20 and -10 you'll be fine. Also remember that line level out to line level in and mic level out to mic level in.

Eric

Perfect. Thank you!

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