Ozone 6 from iZotope is a major update to the Ozone line-up with an improved visual aesthetic that guides users through every stage of the mastering process. Aside from the fluid workflow, the 'creative' elements of mastering are now front and center, so users can define their own sound with ease.
Two equalizers are included that combine eight bands of adjustable filters with a choice of filter shapes. Each band of dynamics is capable of three types of dynamics processing - limiting, compressing, and expanding, while an exciter module allows for dialing in the right amount of bite or warmth to a master. Precisely adjust stereo width of an audio file using the four-frequency-band Imager module.
Additional presets have been created with outcome-oriented descriptions. Dithering has been updated and includes a set of bit scopes and DC level meters. The application also function standalone, with the added enhancement of third party plug-in hosting. Trim and fade controls are provided, along with SRC (sample rate conversion) on import, plus single- and multiple-file export with the company's MBIT+ Dither.
Current purchases of Ozone 6 are eligible for a free upgrade to Ozone 7 on its release.

Historically, Ozone has been a collection of modules that—for many—have been the go-to solution for getting professional mastering results. However, you still needed a host application to run those plug-ins. Now both versions of Ozone 6 (Ozone 6 and Ozone 6 Advanced) run as a stand-alone app and as a multi-module plug-in. Ozone 6 Advanced adds the ability to run each module as a separate plug-in, introduces a great new module called Dynamic EQ, and includes the Insight metering suite.

A New Look

Ozone 6 is the latest program to feature the crisp, flat iZotope esthetic. Gone are the hyper-colorful themes, now replaced with more muted tones.

The Ozone 6 stand-alone interface.

The stand-alone version can load multiple audio files simultaneously, which allows you to make quick comparisons between different tracks. Each track can be truncated and faded-in/out with a variety of curves, and treated by up to six different mastering modules like dynamics and various tonal processors. All of the modules (with the exception of the Maximizer and Imager) can work in stereo or mid/side channel modes. There’s also a special Plug-in module that allows you to use third-party plug-ins. The modules can be rearranged into customized signal flows for each track, but remember that if you’re using the Maximizer, you’ll always want it to be last in the chain. The Master I/O section meters can be configured for several loudness standards, including the K-System.

'The Auto Match Gain button is perhaps my favorite new feature of Ozone 6.'

Below the Master I/O section is the Auditioning section, which is where you’ll find the Bypass, Mono, (channel) Swap buttons, as well as the Dither section powered by the MBIT+ dithering processor. Next to the Bypass button, you’ll find the Auto Match Gain button, which resembles a small human ear. This is perhaps my favorite new feature of Ozone because it matches the loudness of both the original (unmastered) file and the currently mastered version. This means that clicking the Bypass button allows you to truly listen to the mastering treatments you’re applying without the huge disparity in loudness.

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Equalizer Modules

While it might appear that there are two different modules, the Equalizer and Post Equalizer are identical. But having two EQs allow you to provide some specialized treatments. For example, one could be in L-R mode for independent EQ of the left and right channels, while the other could be in M-S mode for mid/side processing. Both equalizers provide up to 8-bands of paragraphic EQ. Each band has a wide choice of individual filter shapes, and the entire module can operate in Analog or Digital mode. Analog mode provides non-linear phase curves with an analog-modeled flavor, while Digital mode gives you less-colorful filters with linear phase, which is highly desirable for mastering. While in Digital mode, you can set the shape to Surgical mode for uncolored, yet highly precise filter responses.

'It’s really interesting to analyze music that you feel epitomizes high-quality sound, then apply that tonality to your own recordings.'

There’s also a Matching section that allows you to analyze the EQ curve of any audio file, then apply that curve to your mastered file. Remember that Picasso said, “Good artists copy, great artists steal.” The Matching section allows you to do precisely that! It’s really interesting to analyze music that you feel epitomizes high-quality sound, then apply that tonality to your own recordings.

Dynamics Modules

The Dynamics module is a four-band compressor, expander, and limiter. Like many Ozone modules, it has the unique Learn feature that analyzes the frequency spectrum of the audio, then places the crossovers at complimentary points. Then you can adjust the dynamics controls individually for each band. There are Peak and RMS detection modes, as well as an Env mode that tracks the envelope of the audio and reacts accordingly. This creates a very natural compression response.

'The Dynamic EQ offers incredibly precise tonal control over very narrow bands.'

The Maximizer module is a mastering limiter with three different IRC (Intelligent Release Control) modes. IRCI provides a very gentle release, IRCII works best with percussive instrumentation, and IRCIII is the most complex and aggressive mode. In fact, it includes four custom timbral qualities with which to customize the tonality of the limiting.

Dynamic EQ Module

This innovative new module comes with Ozone 6 Advanced, and I’ve waited for someone to develop this type of process for a long time. The Dynamic EQ module is a four-band equalizer and shares many of the filter shapes and phase responses of the Equalizer and Post Equalizer. What sets it apart from every other EQ is the dynamic settings for each band. Sure, a multi-band compressor (like the Dynamics module) can craft the output of a wide frequency spectrum. But the Dynamic EQ offers incredibly precise tonal control over very narrow bands, which allows you to set a threshold level around specific frequency band, then apply compression (or expansion) when that threshold is breached. Maybe you have a mix with a breathy vocal that sounds brilliant until the crash cymbals make the high end feel overbearing. With the Dynamic EQ, Ozone 6 has a solution for that.

The Dynamic EQ control panel.

Exciter Module

The Exciter module can offer harmonic excitement reminiscent of the aural exciters of yesteryear, but has a very wide range of other treatments. It has six flavors of excitation including Warm, Retro, Tape, Tube, Triode, and Dual Triode, the latter three are all modeled from the saturation effects of preamp tubes (valves). The module has four-bands with individual amount and mix controls, along with an oversampling option. If you have a fairly powerful computer, I’d recommend enabling the oversampling because it can eliminate the potential for aliasing.

Imager Module

The Imager module is a four-band spacial-control processor that can widen or narrow the stereo image of four frequency ranges. It also has a Stereoize control that gives a stereo image to mono audio tracks, all while maintaining proper phase alignment. You’ll also get a phase correlation meter and a very useful Vectorscope with Polar Sample, Polar Level, and Lissajous (oscilloscope) visual feedback. (The Vectorscope and phase correlation meter are always tapping the main output of Ozone, regardless of where the Imager is placed in the signal flow.)

The Imager module control panel.

What’s Missing

Some long-time Ozone users might miss the reverb module. It was a great-sounding reverb, but most mastering engineers don’t apply reverb during the mastering process. For those that do, there’s the Plug-in module with which to apply a reverb of their choice. Others might wonder about the Meter Bridge in the Advanced version, but it has been replaced by Insight. And since Insight is a plug-in unto its own, it can be used in any plug-in capable host.

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Conclusions

The stand-alone version of Ozone 6 provides mastering muscle for anyone who is producing music in any program, especially those that might not have plug-in capabilities. That said, Ozone still isn’t an audio editor, for it only provides fades and file trimming. For issues like phase correction, track crossfading, and non-linear file format support (like AAC and FLAC), you’ll still need a dedicated program like Steinberg WaveLab or Sony Sound Forge. But chances are that users of Ozone 6 Advanced will already have an audio editor, and will therefore use the Ozone plug-ins rather than the stand-alone app.

'You’d be hard-pressed to find a more complete mastering solution than Ozone 6.'

Like its progenitors, you’d be hard-pressed to find a more complete mastering solution than Ozone 6. It has the depth and complexity that seasoned professionals demand, along with intuitive operation and loads of factory presets to satiate the desires of first-time users. Regardless of the other processors you’re currently using, Ozone 6 will provide a wealth of mastering potential with unique sonic treatments.