Acustica Audio intros Purple 4: Hyper Engine Upgrade with New MT Ultra Mastering EQ

Simply put, Purple 4 is the most extensive collection of legendary passive equalizers on the market. It contains 8 different plugins, from an authentic vintage treasure of a machine, as well as modern re-issues of the same iconic designs. Meticulously sampled using top-tier analog equipment, Purple 4 delivers vintage character and modern flexibility, available in VST3, AAX, and AU formats.

Purple 4 - What's new?

We have taken the Purple suite to a whole new level by adding a new powerful tool, called Purple 4 MT Ultra, for better performance and sound quality.

This upgrade brings essential improvements, including Resize, Listening modes, an upgraded plugin engine, bug fixes, and various performance optimizations, ensuring a more efficient and stable user experience.

About the Plugin Suite

Purple 4 consists of eight separate plugins:Purple 4 P1 (Vintage tube-based, passive program Equalizer)
Purple 4 PAA (Tube-based passive program Equalizer reissue)
Purple 4 M5 (Classic mid-range tube EQ)
Purple 4 M5V (Vintage classic mid-range tube EQ)
Purple 4 H2 (Vintage single-channel tube EQ )
Purple 4 HLF (Passive 12dB/oct high/low pass filter)
Purple 4 Pre (Preamp standalone module)
NEW Purple 4 MT Ultra (Mastering True Stereo EQ)

Key Features

Faithful Analog Hardware Emulations: Includes a total of 8 different standalone plugins, each replicating legendary studio EQs and preamps.
New MT Ultra Equalizer: A mastering-grade equalizer designed with ultra-detailed bass, high dynamic range, and refined top-end clarity.
Advanced Monitoring Options: Offers multiple precision listening modes—Delta (Δ), Left/Right (LR), Mid (M), and Side (S)—for improved mix accuracy and stereo field analysis.
Hyper Technology: Our proprietary modeling approach delivers improved processing efficiency, reduced CPU usage, and ultra-realistic analog response.
Factory Presets: Developed by world-renowned sound engineers, these presets provide immediate creative inspiration and optimal starting points for a variety of use cases.
Adaptable GUI: Fully resizable user interface ensures seamless compatibility across screen resolutions and DAW environments.

Purple 4 MT Ultra: Mastering True Stereo EQ with modern sonic enhancements

Purple 4 MT Ultra is a high-end stereo mastering equalizer plug-in inspired by a renowned solid-state Eq. It combines minimalism and sonic excellence with advanced digital features such as stereo/mid-side processing, precision filtering, and enhanced saturation. Its timeless analog-inspired layout offers musicality, depth, and precision for mastering and mix-bus processing.

Designed as a true stereo processor, each EQ band has dual independent controls for left and right channels, or can be linked via the CLINK function. The M/S (Mid/Side) mode enables spatial tone shaping with surgical control over stereo imaging.

Purple 4 MT Ultra GUI

Technical information:

Supported formats: VST3, AAX, and AU.
Available sample rates: 44.1, 48, 88.2, and 96 kHz.
Compatible with Windows 10 and 11.
Compatible with macOS 10.15 (Catalina) to macOS Sonoma (version 14.x).
Intel, AMD, and ARM compatible.
Native Apple Silicon support (Rosetta not supported).

Price and availability

Purple 4* introductory price: €79 | 62% OFF until June 11, 2025 at 11:59 pm CET (reg. price €209)

Get it here!

*Purple 4 is a FREE upgrade for current Purple users!

The product is at an introductory period for the first four weeks after release or until the first official version is released; this implies that the product may receive improvements, changes, or fixes available through Aquarius Desktop updates.

Try our FREE 30-Day Trial

Note: Purple 4's trial version includes 44.1 - 48 - 88.2 - 96 kHz sample rates.

Please remember that trials expire 30 days after authorization, and we strongly recommend not using trial products in commercial sessions or any important project.

Purple 4 user's manual

Purple 4 webpage: https://www.acustica-audio.com/shop/products/PURPLEP1