FabFilter Pro-Q 4 is a professional-grade equalizer plugin designed to deliver exceptional sound quality and an intuitive user experience. It features high-quality linear phase operation alongside zero latency and unique Natural Phase modes, catering to the needs of mixing and mastering engineers who demand precision and flexibility. The plugin supports up to 24 bands with a wide selection of filter types and slopes, including Brickwall options for high and low cut filters. Its innovative EQ Sketch function allows users to draw response curves directly onto the interface, streamlining the initial setup process.

Beyond traditional EQ capabilities, Pro-Q 4 offers dynamic and spectral EQ options that enable frequency-specific processing within bands, making it easier to handle problem frequencies without affecting surrounding audio. It supports per-band mid/side processing and full surround configurations up to Dolby Atmos 9.1.6. The built-in, fully customizable spectrum analyzer provides real-time visual feedback, and unique tools like Spectrum Grab and EQ Match enhance workflow efficiency. Users can also manage all plugin instances from a single interface, simplifying session-wide adjustments.

The plugin combines advanced features with user-friendly design elements such as a resizable GPU-accelerated interface, full-screen mode, and intelligent band selection. Additional conveniences include parameter editing via dragging or mouse wheel, editable filter slopes with fractional values, and analog-modeled character modes that add warmth and color to sounds. FabFilter Pro-Q 4 also incorporates features like interactive MIDI Learn, undo/redo, A/B comparison, and sample-accurate automation to support professional workflows. This comprehensive tool is built to help audio engineers achieve their desired sound efficiently and creatively.