Quad Image
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About this plugin
IK Multimedia's Quad Image applies mid-side matrix processing across four independent frequency bands, enabling surgical control over stereo width at specific points in the spectrum. This is fundamentally different from broadband stereo processors: rather than widening or narrowing the entire stereo image uniformly, Quad Image lets you isolate and adjust M/S balance where it matters most.
The technical implementation centers on phase-coherent crossover filtering, which is critical when working with mid-side content. Poor filter design introduces phase artifacts that degrade mono compatibility and introduce unexpected tonal shifts. IK's filters here maintain integrity across band boundaries, preserving the relationship between center and side information without introducing audible discontinuities.
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Practical applications range from corrective to creative. On a stereo master, Quad Image solves common mix problems: overly wide bass frequencies that cause translation issues, or excessive midrange spread that obscures vocal clarity. The inverse approach works equally well - opening up top-end width while anchoring low-end content centrally. On drum overheads, the plugin restores focus to kick and snare when they've been captured too wide during recording.
The control set remains intentionally minimal: four bands with width adjustment per band, keeping the workflow straightforward despite the processor's underlying sophistication. This positions Quad Image as essential kit for mixing engineers who demand precision without complexity. While specialized stereo imaging tools exist at various price points, few offer this combination of multiband architecture and phase-accurate M/S processing in a single, accessible interface. It's become standard on professional master buses where stereo field correction is non-negotiable.