ACX RMS level

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ACX RMS level

Permanent link to this post Posted by snazy » Sun Jun 18, 2017 7:14 pm

Hey guys,

so im currently recording a aduio book for audible and i have to meet the ACX expectations and im using the RMS Normalizer and the Limiter to set the levels to pass but they only get close (i need em to be exact for ex : i set the rms norm. to -20 db --> its 26,..) im using the latest version of audacity and my rms needs to between 23dB and -18dB, my peak lvl has to be -3db and max -60db background noise.

PS: procedure --> 1. record 2. set rms lvl 3.limit to -3db result--> not exactly the values i need ;(

pls help me if you can :)
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Re: ACX RMS level

Permanent link to this post Posted by kozikowski » Sun Jun 18, 2017 10:26 pm

I haven't gone around and cleaned up the older versions, yet. SetRMS is the older program. The new Program is RMS Normalize. You also need to know the default RMS Normalize isn't good for audiobooks. Change the setting from -18dB to -20.

The updated and checked AudioBook Mastering version 4 is here.

viewtopic.php?f=64&t=96103

This document also has a separate paper on noise for when you get that far. There are several Noise updates and programs missing from the older processes. We can recover from some broken microphones now.

One item stressed multiple times down the paper is Export a WAV copy of your raw reading in a safe place. There is a temptation for the New Reader to read a chapter, process, clean it, and submit without ever making backups. The first time something goes wrong, you'll be reading it again from the beginning.

Let me know if you get stuck on this new process. I tried to make it step by step and relatively simple.

Koz
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Re: ACX RMS level

Permanent link to this post Posted by kozikowski » Sun Jun 18, 2017 10:47 pm

There are also ways to check your work as you go to see where you went off the rails. I didn't include them to keep the paper short. If everything goes well, nobody wants to hear painful details about audio theory.

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Re: ACX RMS level

Permanent link to this post Posted by snazy » Sun Jun 18, 2017 10:53 pm

Thank you for your fast reply !

i downloaded the new version of it and it does set the rms to the value i want it to but if i use the limiter now to set it to -3 the rms changes how do i set both to the values i need them to be without the one affecting the other ?

kind regards,

snazy
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Re: ACX RMS level

Permanent link to this post Posted by kozikowski » Sun Jun 18, 2017 11:24 pm

im using the latest version of audacity

Which is?
the rms changes

To what?

Are you using ACX Check to see these values?

Image

What are the top three dB values in your Check panel?

These settings all affect each other. You can't stop in the middle and declare failure.

Are you using Low Rolloff at the beginning of the process like the recipe says? That changed, too. It used to be an external, manual tool called LF-Rolloff. Now it's built-in to Audacity. Much faster.

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Re: ACX RMS level

Permanent link to this post Posted by kozikowski » Sun Jun 18, 2017 11:35 pm

One oddball observation. Are you in Mono (one blue wave)? Some of the correction tools can act wonky if you're in stereo (two blue waves). It's not a shootin' offense, but ACX would really rather you be in mono and stay that way through the whole show. They will accept stereo if you insist.

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Re: ACX RMS level

Permanent link to this post Posted by kozikowski » Sun Jun 18, 2017 11:39 pm

my peak lvl has to be -3db

No it doesn't. It has to be quieter than -3dB. The Limiter setting was chosen at -3.5dB so your conversion from WAV to MP3 doesn't bump you up over -3.0dB.

WAV to MP3 conversion can affect volume and it's unpredictable.

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Re: ACX RMS level

Permanent link to this post Posted by kozikowski » Sun Jun 18, 2017 11:50 pm

I didn't say anything about mono sound file in the paper. It's not critical, but it's recommended......

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Re: ACX RMS level

Permanent link to this post Posted by snazy » Mon Jun 19, 2017 1:33 pm

dear koz,

thx again for replying so fast !

okay so i'm using the latest ver of audacity (2.1.3) and have it set to stereo.
I set the RMS to -20db and then i set the limiter to -3db if i do that the results (with the acx check tool) are : peak lvl : -3.5db rms lvl : -27.1db (fail) and noisefloor : (-290.0db) (i have several audio tracks and it measures for everyone of them and they all have different values but are quit similar (the RMS lvl is a bit higher and a bit lower on some, like 29.2, 30.9 and 24.7) to the values above)) and i haven't used low rollof will try that out now.

kind regards,

snazy
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Re: ACX RMS level

Permanent link to this post Posted by snazy » Mon Jun 19, 2017 1:41 pm

Dear koz,

could you perhaps explain to me, how i do the equalization rollof thing ? i would highly appreciate that !

kind regards,

snazy
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