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  • Feb 20, 2011
When to use normalization
  • Genre: Audio
  • Level: Intermediate
  • Time to Complete: 5 minutes
  • 9 comments — Join Discussion

Preview these Studio & Recording Techniques Tutorial-Videos

Pro Tools 10 113 : Pro Mixing Techniques - Play IconPro Tools 10 113 : Pro Mixing Techniques - Preview Video
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There are some basic processes that remain firmly in the "jargon category" to some beginners. Although Normalization is available as a feature in just about every DAW (and Audio Editing software) some users may still not know when to use it.

Hopefully this Quick Tip will go some way to clarifying when to apply normalization techniques to your music.

What is Normalization?

As this is only a brief description of the process we'll not delve too heavily into the maths. Essentially, normalization is a process that raises the level of any audio to a pre-defined maximum without clipping.

When audio is normalized your software will search the file for a peak level and move this to the defined maximum level. The rest of the file will then be brought up to the same relative level. This is how zero clipping is achieved.

Many applications simplify the normalization process and use 0db as the default maximum while others do allow the user to pre-define the level. You'll usually find that dedicated, professional sample editors such as Peak Pro (OSX) and Wavelab (Windows) will sport a more comprehensive feature set.

When to Normalize

Normalization can be a great tool for quickly boosting the level of a sample or recording without worrying about clipping. Remember this is just a relative boost of your signal, so no real processing is taking place. Your audio should come out sounding the same as it went in!

The ideal stage to apply normalization is just after you have applied some processing and exported the result. Compression, modulation effects or some other process may have reduced your gain. Normalization can help you here.

Of course you could simply raise the gain later but applying normalization can be a quick fix and give you a good healthy gain level right at the source. This may often help you to mix a dynamic sound and give you a nice hot signal going into further processors.

Progressing Cautiously

There are situations when you might want to think twice about normalization as an option. The main reason for this is that when increasing gain using any technique, it's not just your signal level that is increased but also the level of any noise or defects present in your audio.

With this in mind, if you choose to normalize a very quiet recording that has a fairly high noise floor, the noise will be increased with the signal. This will only lead to a higher noise level and that is never a good thing.

In these situations it's probably a good idea to go back to the drawing board or think about restoration or noise reduction tools. In many cases though, normalization can be an extremely useful tool and certainly a process to be aware of.

Check out these tutorials for more Studio and Recording Techniques!

Preview these Studio & Recording Techniques Tutorial-Videos

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Mo Volans

Mo Volans

Mo has been a professional in the music industry for around 15 years. He has released material with the world's leading record labels and also produces music for TV and Film. Mo is also a prolific writer and is a regular contributor to magazines such as Music Tech, Future Music and EQ magazine. There isn't a piece of music software that Mo isn't intimately familiar with and he lives happily on the cutting edge of music technology

Comments

Feb 21, 2011
Mojave
Great article! When you're doing your own work and Logic is the final and finished output, normalizing is a nice way to top it off. I agree, back it off of 0db. I use -1db down because Most internet downloads come out louder. Sometimes it helps.

It might be worth mentioning that if the final mix is heading to a mastering house, they prefer it not be normalized and like their track levels left with at least 6-9dbs of headroom.
Feb 22, 2011
Hrmonik
Is it okay to normalize the output of the project in the bounce section ? any advantages/disadvantages of doing so ?
Feb 22, 2011
Mo Volans
Victor... 100% agree with your comments there ;)

and Harmonik, yep you can normalise in the bounce section. This is exactly the same as normalising using any other method.
Feb 22, 2011
Mojave
Harmonik,
Logic has so much headroom it is quit literally impossible to overload it internally. If any track were hitting 0db or higher, the beauty of Logic is you can simply lower the level, even at the output. If the level is goin into a plug in, that is another story and clipping or overload can occur. Logic is able to Handel incredibly diverse levels. Normalizing works well to balance up tracks in the mixing stage without leaning on compressors. I liked the part in this article where Mo points out, the ideal time for normalizing is after putting some processing on the track. That is a great tip to keeping you mix in "homeostasis"... So to speak.
Feb 22, 2011
fredwardo
This article got me thinking...
When recording music (as I understand it) there's three phases (recording, mixing and mastering). You guys have plenty of tutorials on each of these, but I'm not sure how one blends into the other. Victor mentioned that mastering engineers like a few db of headroom. This was news to me, but obviously, a very important bit of info. Any thoughts on a tutorial where you follow a song from microphone to iTunes (or CD)? Just a thought. Thanks for all the great content!
Feb 23, 2011
Mojave
There are a lot of good mastering facilities which usually specify what they like for file format and so forth. I would do some checking and get a feel for what you're looking for answer wise. Each facility will want something specific but almost all need some headroom to treat the material so 6-9 dbs as a good rule of thumb but not written in stone.
Feb 23, 2011
Hrmonik
Do mastering engineers allow clients to sit in sessions ?
Feb 25, 2011
Mojave
Do magicians allow customers to sit in during rehearsals?
May 02, 2011
Alan
What happens to the quality of music that's been normalized twice. For example: I'm ripping and recording old disks and tapes I have and saving them as WAV files. Sometimes the volumes don't come out the same even though the burning program is checked to normalize. Separate programs for ripping or recording have a normalize feature, so it could be done once there and then again in the burning program, but does this make the music sound a bit flat or odd ? Thanks ....
Alan
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