Ozone Maximizer splits Stereo Independence into separate Transient and Sustain controls, with 0 percent fully linked and 100 percent fully independent limiting. Full independence can produce more output level, but iZotope also warns that it can narrow the stereo image.
Stereo Independence does not alter Ozone Maximizer True Peak processing, so you can tune channel linking without changing the job of the True Peak switch. The useful question is not how wide you can make the numbers look, but how much left and right separation the limiter can tolerate before the image starts moving.
A linked limiter applies the same gain reduction to both channels when either side triggers it. This protects the position of centered material because the left and right levels fall together, though the quieter side may receive attenuation it never needed.
The cost is easy to miss if you only watch meters. Unequal gain reduction changes the left-to-right level relationship, so a vocal, snare, bass, or other centered element can appear to lean sideways for a moment when surrounding material is strongly asymmetric. The effect becomes obvious when a centered vocal overlaps a wide cymbal crash, since one side can be pulled down harder than the other.
The engineering trade-off is not unique to Ozone. A linked limiter gain reduction across stereo channels is used in multichannel limiter design specifically to avoid image shifts, while the same design also notes that permanent linking can reduce available output because one channel is attenuated when only the other needs control.
This explains the apparently odd warning about narrowing at full independence. Stereo width is not just the level of material living at the edges. A stable center also helps define width, and independent limiting can make that center less dependable even while the side information remains active.
Transient independence becomes noticeable on mixes where percussion is unevenly distributed. A hard-panned hit, off-center clap, wide drum layer, or bright effect can make one channel ask for more limiting than the other, and partial independence lets Ozone avoid pulling both sides down by exactly the same amount.
Sustain independence has a different risk. Pads, guitars, reverbs, synth layers, room sound, and long bass information can hold unequal energy between channels for much longer than a drum hit, so independent gain movement has more time to alter the perceived balance.
You do not need matching Transient and Sustain values. A mix with a solid center and very wide percussion may tolerate more transient independence while needing its sustained material kept closer together. Another mix can behave oppositely, especially when long stereo textures dominate, and the drums are mostly mono.
Use a section with real asymmetry. A perfectly centered verse may tell you almost nothing, while a chorus with wide cymbals, doubled guitars, panned percussion, reverb tails, and a centered vocal will expose linking problems quickly.
Pay particular attention to the vocal when a strong side element hits. If the vocal seems to twitch toward one speaker, the limiter is changing the channel relationship enough to become audible, even if the master sounds wider or louder during a quick comparison.
Gain matching matters here because extra loudness can disguise a damaged image. Compare the setting against 0 percent at a similar perceived level, and switch attention between the center, the edges, and long decays instead of judging the whole master in one impression.
Moderate values often leave more of the benefit without turning the Maximizer into two unrelated limiters. The goal is not maximum independence. You only need enough separation to stop one channel from making the other work harder when the mix can handle the resulting movement cleanly.
Stereo Independence does not alter Ozone Maximizer True Peak processing, so you can tune channel linking without changing the job of the True Peak switch. The useful question is not how wide you can make the numbers look, but how much left and right separation the limiter can tolerate before the image starts moving.
A linked limiter applies the same gain reduction to both channels when either side triggers it. This protects the position of centered material because the left and right levels fall together, though the quieter side may receive attenuation it never needed.
Full unlinking can make the stereo image less stable
Moving both Stereo Independence controls toward 100 percent lets each channel react more on its own. A loud event on the left can trigger more reduction on the left than on the right, which can preserve level on the quieter channel and sometimes increase achievable loudness.The cost is easy to miss if you only watch meters. Unequal gain reduction changes the left-to-right level relationship, so a vocal, snare, bass, or other centered element can appear to lean sideways for a moment when surrounding material is strongly asymmetric. The effect becomes obvious when a centered vocal overlaps a wide cymbal crash, since one side can be pulled down harder than the other.
The engineering trade-off is not unique to Ozone. A linked limiter gain reduction across stereo channels is used in multichannel limiter design specifically to avoid image shifts, while the same design also notes that permanent linking can reduce available output because one channel is attenuated when only the other needs control.
This explains the apparently odd warning about narrowing at full independence. Stereo width is not just the level of material living at the edges. A stable center also helps define width, and independent limiting can make that center less dependable even while the side information remains active.
Transient and sustain linking solve different problems
Ozone does not treat every part of the signal with one stereo-unlink amount. The Transient control determines how independently the limiter reacts to short events across the channels, while Sustain applies the same idea to material that lasts longer.Transient independence becomes noticeable on mixes where percussion is unevenly distributed. A hard-panned hit, off-center clap, wide drum layer, or bright effect can make one channel ask for more limiting than the other, and partial independence lets Ozone avoid pulling both sides down by exactly the same amount.
Sustain independence has a different risk. Pads, guitars, reverbs, synth layers, room sound, and long bass information can hold unequal energy between channels for much longer than a drum hit, so independent gain movement has more time to alter the perceived balance.
You do not need matching Transient and Sustain values. A mix with a solid center and very wide percussion may tolerate more transient independence while needing its sustained material kept closer together. Another mix can behave oppositely, especially when long stereo textures dominate, and the drums are mostly mono.
Small changes reveal more than extreme settings
Start from 0 percent rather than treating 100 percent as the destination. Raise one control until the loudest, widest section stops making both channels duck unnecessarily, then listen for center movement before touching the other control.Use a section with real asymmetry. A perfectly centered verse may tell you almost nothing, while a chorus with wide cymbals, doubled guitars, panned percussion, reverb tails, and a centered vocal will expose linking problems quickly.
Pay particular attention to the vocal when a strong side element hits. If the vocal seems to twitch toward one speaker, the limiter is changing the channel relationship enough to become audible, even if the master sounds wider or louder during a quick comparison.
Gain matching matters here because extra loudness can disguise a damaged image. Compare the setting against 0 percent at a similar perceived level, and switch attention between the center, the edges, and long decays instead of judging the whole master in one impression.
Moderate values often leave more of the benefit without turning the Maximizer into two unrelated limiters. The goal is not maximum independence. You only need enough separation to stop one channel from making the other work harder when the mix can handle the resulting movement cleanly.
