The best free EQ for mastering
On the master bus the moves are small and the standard is transparency. A mastering EQ wants three things: an optional linear-phase mode, mid/side (so you can widen or tame the sides without touching the centre), and enough resolution to make half-a-dB decisions.
Updated 2026-07-06What a mastering EQ needs
Linear phase keeps the phase relationships intact across the crossover regions — worth it on the 2-bus where a broad tilt can otherwise smear. It costs latency and can pre-ring, so it's a mastering tool, not a tracking one. Mid/side lets you, say, gently lift the centre's presence or roll off harsh sides. And a clean analyzer keeps your eyes honest about what your ears are doing.
- Linear-phase mode for transparent broad moves on the master.
- Mid/side and per-band placement (M, S, L or R).
- Small moves: ±1–2 dB, wide Q, a few bands at most.
- A dynamic band to tame a resonance the whole mix shares.
Using it without wrecking the master
Reference at matched loudness so a boost doesn't just sound 'better because louder'. Make fewer, wider moves than you think you need. Keep a dynamic band in reserve for the one frequency that jumps out on the loud sections instead of statically cutting it everywhere.
Master with AURORA — free
AURORA has a true linear-phase mode, an analog-matched Natural mode, full mid/side and left/right, per-band dynamics and a clean live analyzer — everything a transparent master bus EQ needs, at no cost.
Do I need a linear-phase EQ for mastering?
Not always, but it helps for broad moves on the 2-bus by preserving phase across bands. It adds latency and can pre-ring, so use it deliberately — many masters mix natural-phase and linear-phase bands.
Is a free EQ good enough for mastering?
Yes, if it has the right features: linear phase, mid/side, and clean, high-resolution bands. The engineering discipline — small moves, matched-loudness referencing — matters far more than the price of the plugin.