SPECTRAL EFFECTS: EQ - LINEAR PHASE EQ

Linear Phase EQ is a precision equalizer in Logic Pro designed for transparent, surgical frequency shaping without introducing phase shift. Unlike the standard Channel EQ—which applies minimum-phase filtering—Linear Phase EQ maintains phase coherence across the entire frequency spectrum, making it ideal for mastering, parallel processing, and detailed corrective tasks. Its transparent response is particularly useful when adjusting complex material such as full mixes, acoustic recordings, or layered buses.

Key Features

• Eight-band layout (same band set as Channel EQ) — Low Cut, Low Shelf, four parametric mid bands, High Shelf, High Cut; bands are color-matched to the graphic display. 

• True linear-phase filtering — preserves the phase relationship between frequencies so summed/multi-mic material remains coherent. Use this when you must avoid phase shifts introduced by minimum-phase EQs. 

• Fixed CPU cost / increased latency — CPU usage does not increase with the number of active bands, but latency is higher than Channel EQ (so expect extra delay during processing/export). 

• High-resolution graphic display & drag-to-edit — click or drag points on the frequency curve to change center frequency, gain, and Q. Drag vertical/horizontal lines to edit Q or gain; modifier keys allow constrained edits (Command, Option-Command, etc.). 

• Q-coupling option — when enabled, dragging a band’s gain also modifies its bandwidth (Q) for more musical broad/narrow adjustments. 

• Band selection logic & editing safety — selected bands are highlighted; overlapping bands that fall within the selected band’s active area cannot be chosen, reducing accidental edits. 

• Precise numeric fields — Frequency, Gain, and Q fields show exact values for precise adjustments; bands highlight in the display as you move the pointer. 

• Analyzer & visual feedback — built-in spectrum analyzer that shows incoming frequency content with adjustable resolution and smoothing (useful for locating resonances before surgical cuts).

Best Use Cases

• Mastering — where preserving phase relationships across the whole stereo mix is important and you want transparent tonal balance corrections without phase-smearing. 

• Multi-microphone recordings (e.g., drum kits, choirs, orchestras) — keeps microphone sums coherent when you apply corrective EQ across multiple mics. 

• Parallel processing chains — because phase is preserved, parallel sum-backs are less likely to suffer comb-filtering artifacts. 

• Surgical corrective EQ on complex signals where phase relationships are critical (e.g., stereo room ambience, layered synths, ensemble recordings).