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Guide: Room Correction with REW, UMIK-1 and PipeWire (Linux)

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1. Preparation

1. Download REW (Room EQ Wizard) from https://www.roomeqwizard.com/
2. Prefer the version with embedded Java, as newer Java versions may cause REW to malfunction.
3. Connect the UMIK-1 measurement microphone to a USB port.
4. Download the microphone calibration file from miniDSP: https://www.minidsp.com/products/acoustic-measurement/umik-1
   • Choose the 7163423_90deg.txt file if you're measuring loudspeakers horizontally at 90°.
   • REW does not recognize the "Sens Factor" parameter but supports a Sensitivity: -18.3 dB line.
   • Manually add the Sensitivity: -18.3 dB line at the very beginning of the 7163423_90deg.txt file.
   • Completely remove the Sens Factor line to avoid parsing issues in REW.

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2. Set volume levels

Use wpctl to set appropriate microphone and playback levels:

wpctl set-volume @DEFAULT_AUDIO_SOURCE@ 0.9
wpctl set-volume @DEFAULT_AUDIO_SINK@ 0.5

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3. Configure REW

1. Open REW.
2. Go to Preferences → Cal files.
3. In the Mic cal files section:
   • Ensure your active input (e.g., Default Device Default Input) is selected.
   • Click the gear icon to the right of the row and ensure that the checkbox Input device is a C weighted SPL meter is unchecked — this must be off for calibrated microphones.
   • Provide the full path to your 7163423_90deg.txt calibration file.

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4. Measuring

1. Open the Measure tab.
2. Click Check Levels — level should fall between -12 and -6 dBFS.
3. Click Start Measuring.

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5. Exporting filters

• Open the EQ tab after measuring.
• Set the target device type (usually Full range speaker).
• Click Match Response to Target.
• Export filters via Export filter settings as text.

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6. Convert REW filters to EasyEffects format

Copy the contents of the REW-exported text file and paste it into the rew2easyeffects.py script from this repository to generate a configuration file compatible with EasyEffects.

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7. Applying filters in EasyEffects

1. Open the Equalizer tab.
2. Enable the desired mode (usually FIR).
3. Load the generated file using Presets, or import it manually as .json or .txt.
4. Make sure the equalizer is enabled and active.

🎉 Congratulations! Your audio system has been room-corrected.