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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 :)

RED-ONE audio section opinion from a location sound recordist

Stuart English said:
If you have not done so already, check out the new beta Build 18 v3.6.4.

Some questions about Reference Level marks and the mysterious +10dB gain offset are addressed in this firmware release.

I would also recommend downloading the Build 17 v3.4.6 Operations Guide.
Click to expand...

stuart,

I am reluctant to use build 18 until it becomes an official firmware release.

What questions are actually addressed and how please?

I assume you mean Build 17 v 3.4.1 Operations guide (not 6 - as I cannot find a 3.4.6) which is the version of the Ops guide I am using. It is still fairly light on the audio aspects and there is no direct mention in this nor Build 18 Op guide (that I can see) of the reference marks on the audio meters.

Surely someone at Red could provide some definitive answers the the questions raised in this and other threads about the audio issues... it's obviously affecting many people.

I am not aiming this at you particularly (sorry if it seems that way) but some answers would be helpful from someone at Red.
 
Operations Guide and Audio Levels

Operations Guide and Audio Levels

I assume you mean Build 17 v 3.4.1 Operations guide (not 6 - as I cannot find a 3.4.6) which is the version of the Ops guide I am using.
Click to expand...

Actually I mean Build 18 v3.4.6 Operations Guide. My typo - apologies for that.
 
aha ok well that's clear, thanks.

Any news on the audio issues: just what the reference marks are actually referencing and any idea why the audio level which appears to be peaking in the right places on the Red meters is so low in FCP by any chance?

I should also add that when playing back in the camera the audio sounded ok and of a reasonable level (as far as it's possible to tell) but was very low in FCP.
 
Audio Levels

Audio Levels

Any news on the audio issues: just what the reference marks are actually referencing and any idea why the audio level which appears to be peaking in the right places on the Red meters is so low in FCP by any chance?

I should also add that when playing back in the camera the audio sounded ok and of a reasonable level (as far as it's possible to tell) but was very low in FCP.
Click to expand...


The Build 18 Operations Guide explains the audio levels question. As for how FCP represents audio levels - is it using VU or PPM for example - I can't tell you that, all I do know is that 0dBu reference tone into to a RED ONE with Rev B audio hardware delivers 0dBu out again on the 5 pin mini-XLR on playback.
 
Stuart, the b18 ops guide doesn't explain what the 3 lines on the Peak Level Meter represent. If there were one line it would be clear that its 0dB, but since I got my rev B upgraded camera back I now have multiple lines.

Is it from right to left, 0dB, -6, -12?
Is the PLM different for Line input, as displayed in the manual?
 
David beat me to it... but here's the rest of my post anyway....
stuart, thanks for the quick reply but I'm sorry and I may be being both blind and stupid. I have the build 18 Ops guide in front of me I can find no reference to what the three lines on the audio meters are actually referencing. Please specify which page of the manual mentions these three marks and explains what they are referencing. I am not the only one this was asked about earlier in this thread (3rd of March). I am also not the only person having audio level problems. There are a few threads reporting similar/the same issues.

It seems simple enough. Reference tone from a mixer (a fixed level) completely overloaded the input at line level on my camera. The 416 I plugged directly into ch 2 (and of course set to mic level) appeared to respond relatively appropriately on the meters and on playback in the camera but was about -8db low in FCP. This does not make sense to me. If it is clear where 'unity' is in terms of the level and the marks perhaps the problem would not be there. I'm not a sound expert so I know I might be doing something silly but I have been dealing with this stuff for quite a long time and the people I work with who are sound recordists also can't work out what's not working correctly - they also read build 18 Ops guide to try to figure this out without success.

FYI I have Rev B audio hardware and I am using the correct cables and connectors.

FCP captures digital audio as "an exact copy" (that's what their manual states and what I would expect - without changing any levels)
so the problem is that what appears to be within Red's three reference marks is captured by FCP at a very low level.

hmm
 
Audio meter lines

Audio meter lines

Stuart, the B18 ops guide doesn't explain what the 3 lines on the Peak Level Meter represent. If there were one line it would be clear that its 0dB, but since I got my rev B upgraded camera back I now have multiple lines.

Is it from right to left, 0dB, -6, -12?
Is the PLM different for Line input, as displayed in the manual?
Click to expand...

There are no longer 3 three lines on the meter for Build 18, just one for 0dBu (like we had on Build 16)

On Build 17, the corresponding 0dBu line would be the right one of the three, so forget the other two.
 
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