Harrison Mastering EQ

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The Mastering EQ features a revolutionary filter shape that was originally developed for precise speaker management. This means that the resulting curves are perfect for making broad, musical changes to the final tone while maintaining the harmonic balance between the elements of your mix.

Unlike ordinary EQs, when two adjacent bands are adjusted the resulting curve is flat across the band edges, rather than having discrete peaks and valleys. This causes less change in your instrument and vocal character, while applying the desired tonal balance to your mix. Managing a powerful full-range EQ has never been so fast and easy!

Ultra-fidelity equalizer

Harrisons Mastering EQ is a high-fidelity equalizer that gives you the sound and feel of Harrison’s XTool plugins for digital consoles. The XTool plugins are renowned for their sonic quality and versatility, and the Mastering EQ brings you the same level of excellence. The Mastering EQ lets you shape your mix with precision and ease, using a variety of features and modes that can help you achieve your sonic goals. The Mastering EQ is based on Harrison’s XTool plugins, which are trusted by professional engineers around the world.

31 Control Bands

The Mastering EQ lets you sculpt your sound with 31 bands of precision, covering the entire audible spectrum. Each band can be boosted or cut by up to 14dB, giving you total control over the tonal balance of your mix. Whether you need to add some warmth, clarity, punch, or sparkle, the Mastering EQ can help you achieve your sonic goals.

You can easily adjust the Mastering EQ with your mouse, using intuitive gestures and shortcuts. The Mastering EQ is designed to make your workflow fast and easy, so you can focus on the sound.


Harrison is renowned for its hi and low pass filters and the Mastering EQ is no exception. Mastering EQ has gentle yet powerful high-pass and low-pass filters that can help you refine the sound of your mix. The filters can help you cut out any unwanted low-end rumble or high-end hiss from your mix, and make it sound more crisp and clean. You can choose between 6dB/oct and 12dB/oct for the slope of the filters, depending on how gently or sharply you want to roll off the frequencies beyond the cutoff point. You can also fine-tune the frequency of the filters using the sliders above and below the curve. The high-pass and low-pass filters are one of the many features that make Harrisons Mastering EQ stand out from other EQs.

DSP curve-match

Mastering EQ features an innovative DSP curve-match technology that allows you to create a flat top across adjacent bands. This means you can boost or cut multiple bands without creating any unwanted bumps or dips in the frequency response. You can achieve a smooth and natural sound with the DSP curve-match, and avoid any phase issues or artifacts that might occur with other EQs. The DSP curve-match is a unique and powerful feature that can help you master your mix with precision and ease.

RTA Analyzer “Graph” Mode

The “Graph” Mode lets you see the frequency spectrum of your mix with 1/10 octave precision. Unlike other RTA analyzers that use FFT-based bands, the Mastering EQ uses equally spaced bands that give you unparalleled accuracy in the low frequencies. You can use the “Graph” Mode to spot any problems or imbalances in your mix and adjust them. The “Graph” Mode is a tool that can help you master your mix with confidence and ease.

RTA Analyzer “Lightning” Mode

Mastering EQ features a “Lightning” mode that gives you a unique and innovative way to visualize the frequency spectrum of your mix. The curve shows you the average level of each band, while bright flashes indicate the location of transient peaks in the signal. You can use the “Lightning” mode to spot any frequency spikes or imbalances in your mix, and adjust them with the Mastering EQ. The “Lightning” mode is a cutting-edge and exciting feature that can help you master your mix with a high degree of accuracy.

Free trial for 14 days

To start a 14-day free trial, simply download and install the Mastering EQ plug-in below.

Upon launching your DAW, click the 'Try' button to activate your free trial. If the Activation Experience pop-up does not appear on launch, simply add the plug-in on any insert. You will be asked to log into your iLok account, and the trial authorization period will begin.


Use the SSL Download Manager to install and manage your SSL plug-ins. Click on the button below and log into your SSL Account to get started.

SSL Download Manager (macOS & Windows)


Mastering EQ (Linux)


For offline installers, please visit this FAQ.


Mastering EQ Plug-in User Guide