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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

lowering/raising audio input

Jeremiah McLamb

Jeremiah McLamb

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The scroll wheel on the evf is supposed to change the input level on channel 1 & 2...correct? If so, mine does not do it. Need to know how to adjust the incoming audio signal. I tried going through the menu and adjusting the audio input and that has no effect whatsoever.

And what do the lines on the audio meter represent. Specifically the larger bold line. Is that -12db.. 0 ..or what?

Thanks
jeremiah
 
EVF adjustment of audio

EVF adjustment of audio

The scroll wheel on the evf is supposed to change the input level on channel 1 & 2...correct? If so, mine does not do it. Need to know how to adjust the incoming audio signal. I tried going through the menu and adjusting the audio input and that has no effect whatsoever.
Click to expand...

Which build are you working on?
 
jerfilm said:
The scroll wheel on the evf is supposed to change the input level on channel 1 & 2...correct?
Click to expand...

Are you on mike or line level input?....maybe you're on line level.

You can only adjust levels whilst on mike level.

D
 
jerfilm said:
interesting...why is that? ...I am on line level...coming from a mixer.
Click to expand...

Well line level is supposed to be a fixed industry standard so there shouldn't be a need to adjust it, but most mixers still have input gain tweaks because it's industry standard except when it's not!
 
Check out this analysis of Red audio by Sound Devices:
http://www.sounddevices.com/notes/cameras/red-one/
Numbers by the hash marks would be helpful, Red Team! I get asked this by lots of sound department fellows... according to SD:
>>>There is a solid line shown at an arbitrary -8 dBFS and a very faintly emboldened line at -20 dBFS.<<<
Anyway, line level adjustment might be a nice addition at some point... but what do I know? I'm a camera guy...
Cheers,
Harry
 
harryclark said:
Check out this analysis of Red audio by Sound Devices:
http://www.sounddevices.com/notes/cameras/red-one/
Numbers by the hash marks would be helpful, Red Team! I get asked this by lots of sound department fellows... according to SD:
>>>There is a solid line shown at an arbitrary -8 dBFS and a very faintly emboldened line at -20 dBFS.<<<
Anyway, line level adjustment might be a nice addition at some point... but what do I know? I'm a camera guy...
Cheers,
Harry
Click to expand...

as an audio guy, i agree that line level adjustment would be helpful! padding cables or attenuating line output on mixers shouldn't be necessary and, i might add, no where near as practical as adjusting a gain display.

beyond that, awesome camera!
 
Well..

Well..

To the best of my understanding, the 'line input' option sends the audio directly to a A/D. Anytime you have a gain/level adjust you are sending the signal through an amplifier circuit. To preserve signal quality RED eliminates a layer of electronics between the signal and the A/D.

Which brings me to the padding. Because of the (supposed) direct path to the A/D the padded (attentuated) line provides a little headroom above the normal (or at least Sound Devices) spec line level, as not to ruin the A/D.

I will be awaiting correct from someone with a circuit diagram I don't have.
 
Harry Clark said:
Numbers by the hash marks would be helpful, Red Team! I get asked this by lots of sound department fellows... according to SD:
>>>There is a solid line shown at an arbitrary -8 dBFS and a very faintly emboldened line at -20 dBFS.<<<
Anyway, line level adjustment might be a nice addition at some point.
Click to expand...

I've just received our camera back from Red with the audio upgrade.
Using release Build 17, upgraded audio board, with new cables.
Audio menu settings are as follows: Line level, 0db.

What I am finding regarding line level audio levels is totally confusing.
With the mixer supplying zero level tone, the LED display shows shows
levels into the orange quadrant of the display. This is to the right of the
solid line. Having lowered the output of the mixer to the solid line of the camera LED display,
my mixer now displays an output of -10db.
Clearly something is out of cal.

Exactly what levels are these hash marks representing?
There is no information in the manual.
What is the proper procedure for establishing a -20db input level
when using a 0db reference tone from a mixer.
Any one from Red?

This camera begins a commercial job Friday, utilizing dual audio recordings.
Thanks much.
 
Don't mean to highjack the thread, but sort of related question... Can you send a single feed to multiple tracks and set different input levels as protection?

Chris
 
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