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Throughout the development of Ozone, we spent countless hours downloading independent 
(typically “un-mastered”) songs from mp3.com and analyzing them. There are some really 

well mastered material songs there, but there are also a lot of songs that could use a little 

Ozone. In particular, we found that the stereo imaging was a common problem on these 

independent projects. 
 

Granted, stereo imaging is a tough task. It’s difficult to get a cohesive mix that still has a 

sense of space and imaging. Usually the over-application of effects makes it all the more 
difficult to “image”. A second problem, when compared to many commercial mixes, is that 

they have some degree of stereo widening or other enhancement applied. Just like you’ll never 

get the sound of a multiband harmonic exciter with an EQ, you won’t get that “sound” of a 
stereo widener with panning. 

 

It seems like we start each effects section by suggesting that you don’t overuse the effect. 

Stereo widening is no exception. The modules in Ozone have high quality processing and are 
designed to sound very natural, so it’s easy to overdo it until the natural effect is no longer 

natural sounding. 

 
Stereo widening a very simple effect, which expands the difference between the left and right 

channels by actually subtracting them from each other. Signals that are present in both 

channels are decreased. Since a signal that is the same in both channels is perceived as “in 
the middle” the result is a wider sound. This “channel subtraction” is a simple effect to design, 

but the strength in Ozone is in the multiband separation and summation. A full bandwidth 

stereo widener is trivial, where a multiband one (that sounds natural without phase or 

summation artifacts) takes significant effort to implement. 
 

If you’re following the principle behind stereo widening, you may already be seeing the 

potential misuse of it. As you widen the left and right you lose the middle. In midrange 
frequencies this can create a “hollow” sound or a mix with a hole in the middle. In lower 

ranges, especially if your bass and kick are panned to the middle, you can completely lose the 

low end. 
 

The solution is a multiband stereo widener that allows you control the amount of widening 

applied to individual frequency regions. And not surprisingly, that’s what you have in Ozone. 

Bonus Tip: Alt-click is a “solo” key combination in Ozone. For example, if you Alt-click on the 

EQ you solo a region of frequencies. If you Alt-click on the Active light of a module (as shown 
below) you solo that module. Or…Alt-click on the M (Mute) button of a multiband to solo that 

multiband – as shown below as well.  

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ozone™ Mastering Guide 

Page 39 of 66 

©2003 iZotope, Inc.