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dBu level vs. whatever FCP 7 shows

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Arturo Glass
dBu level vs. whatever FCP 7 shows
on Apr 1, 2014 at 9:43:27 pm

I need to delivery a project with the following audio limits:

Dialogue between +2dBu and +6dBu
M&E peaking no more than +8dBu

What are the equivalents in the audio meter that FCP 7 shows? Are those measured in VU? If so, what is the equivalent to 2, 6, and 8dBu, respectively?


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Michael Gissing
Re: dBu level vs. whatever FCP 7 shows
on Apr 2, 2014 at 12:08:18 am

VU metering can be 'converted' to dbfs (digital scale used by NLEs and DAWs). 0dbu is usually quoted as -20dbfs. So +8dbu is -12dbfs.


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Arturo Glass
Re: dBu level vs. whatever FCP 7 shows
on Apr 2, 2014 at 1:30:34 am

To understand, VU and dbfs are interchangeable terms (for my purposes)?

Is it always a direct correlation? So then +2dbu would be -18dbfs and +6 would be -14dbfs?


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Michael Gissing
Re: dBu level vs. whatever FCP 7 shows
on Apr 3, 2014 at 5:24:01 am

On 1Khz tone yes there is a direct co-relation


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Andrew Rendell
Re: dBu level vs. whatever FCP 7 shows
on Apr 2, 2014 at 12:40:03 pm
Last Edited By Andrew Rendell on Apr 2, 2014 at 12:42:07 pm

There isn't an equivalent between the metering in FCP and VU.

The internal metering in FCP is instantaneous, so it's not too far different to a PPM (it's not the same though) but it's quite different to a VU meter, which averages out the instantaneous peaks.

I use a software meter via Audio Hijack Pro, so it sits outside of the editing software (effectively looking at the output of the edit system) and I just arrange my screen layout to see it.


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Arturo Glass
Re: dBu level vs. whatever FCP 7 shows
on Apr 2, 2014 at 1:03:08 pm

Do you use Audio Hijack Pro as your meter, or have that send the audio signal to another program? If so, I'd be interested in hearing what software you use for that.


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Andrew Rendell
Re: dBu level vs. whatever FCP 7 shows
on Apr 2, 2014 at 9:42:51 pm

Audio Hijack Pro doesn't have a suitable meter within it for my purposes, I have PPMulator installed as a plug-in within Audio Hijack Pro, because PPM and EBU R128 loudness metering are what I need, VU isn't used much where I am.

You can get some metering software that's standalone, the advantage of using Audio Hijack Pro is that you can use metering software that is normally a plug-in for DAW software (VST or AU) and that gives you much more choice, no point in spending the price of SpectraFoo if PSP Vintagemeter does what you need, IYSWIM.


https://www.rogueamoeba.com/audiohijackpro/
https://www.zplane.de/products/ppmulator
http://mhsecure.com/metric_halo/products/software/spectrafoo.html#tab=1


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