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Equalize Headphones With Equalizer APO and Peace Without Clipping

Load an AutoEQ or oratory1990 profile, set the preamp so the loudest boost still fits and keep the correction on the headphones only.

by@guidox updated:10/30/26 time:25 min level:Intermediate tested on:Windows 11 24H2 works on:Windows 10, Windows 11 tools:Equalizer APO, Peace
TL;DR

Install **Equalizer APO** on the headphone output only, drop the **preamp** by the size of the biggest boost, then load a measured correction curve. Skipping the preamp is what makes EQ clip.

Before you start

Requirements

  • Windows 10 or Windows 11
  • Equalizer APO from https://sourceforge.net/projects/equalizerapo/
  • Peace GUI from https://sourceforge.net/projects/peace-equalizer-apo-extension/
  • A measurement or AutoEQ profile for your headphone model
Step by step

Instructions

01

Install Equalizer APO on the right device

Run the installer and tick **only the headphone output** in the Configurator, then reboot. Ticking the wrong device either corrects your speakers as well or does nothing at all.

⚠ warningThe Configurator can be re-run at any time - that is also the fix after a Windows update.
02

Install Peace

Install Peace, point it at the same device and keep the default sample rate of the headphone output.

03

Import the correction

In Peace open **Import** and load an AutoEQ or oratory1990 parametric file for your model. The bands appear as sliders; the curve is what a measurement rig actually heard.

04

Set the preamp to the biggest boost

Find the largest positive gain in the profile and set **Preamp** to the negative of it. A +6 dB bass shelf means a -6 dB preamp.

Largest boost: +6.0 dB
Preamp: -6.0 dB
⚠ warningWithout the negative preamp, boosted frequencies clip before the amplifier sees them.
05

Verify with a sweep

Play a 20 Hz to 20 kHz tone sweep at a moderate level. No crackle, no hole, no channel imbalance. If it distorts only on loud tracks, lower the preamp another 2 dB.

tipTest with music you know well - sine sweeps hide nothing but music reveals resonance.
06

Save one preset per headphone

Save the configuration in Peace and name it after the headphone. Switching between models is then one click instead of re-importing curves.

Troubleshooting

Common issues

The equalizer has no effect

Re-run the Configurator, tick the correct output device and reboot. Check that Peace writes the config file the APO reads.

Crackling at high volume

Set the device to 48 kHz/24 bit in Windows and keep boosts under +10 dB; the preamp has to cover the rest.

It stopped working after a Windows update

The APO got unregistered. Run the Equalizer APO installer again and re-tick the device.

FAQ

Frequently asked

Does EQ lower sound quality?

Done with a preamp it corrects peaks. Done without one it clips, which is far worse.

Can I use it on speakers?

Yes, with a per-channel config. Room correction needs measurements, not a generic curve.

How to undo this

Press reset in Peace, or re-run the Equalizer APO Configurator and untick the device. Uninstalling both removes the APO completely.

Changelog · 1 entry
  1. 2026-10-30
    First version
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