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Now we will create equalization filters for each channel using REW’s own EQ filters tool.

1. In the “All SPL” tab, select the measurement for which you want to EQ (e.g. “Left Speaker Average” measurement).
2. Make sure that “No smoothing” is set, because we will set the smoothing in the EQ window.
3. In the top menu press the EQ button
4. In the popped-up EQ window, change smoothing to VAR (you can select other smoothing options that fit better). VAR smoothing is good if you will EQ in the whole frequency spectrum and RePhase it later. If you will just EQ the bass frequencies just leave it as is.

Apply the following settings:

• On the right side of EQ window under Equaliser choose rePhase.

• Under Target settings configure a target type as close to your speakers’ true frequency response as possible. In my case “Full Range Speaker”.
• For the MA-200 Gold select:
  • LF Cutoff (Hz): 30 Hz
  • LF Slope: 24 dB/Oct
• Target Level (dB SPL). Should be around the lowest dips of the frequency response to avoid the EQ from boosting too much. You can use the button “Calculate level from Response” which will suggest an appropriate level.
• House Curve: preferred settings for your room. Set target level to have REW set the target level or configure it manually. To be close to the Harman curve use the following settings:
  • LF Rise Start : 250
  • LF Rise End : 20
  • LF Rise Slope : 4,0
  • HF Fall Start : 4500
  • HF Fall Slope : 2,5

• The “Allow narrow filters below 200 Hz” option lets REW use very narrow filters (high Q) to correct peaks from room modes (standing waves) in the low bass region to tame bass peaks, while unchecking it (for device EQ) limits filters to a maximum Q of 5, preventing over-correction and distortion in the bass. It's generally selected for room correction (bass) and deselected for headphone/device EQ.
• Option “Vary max Q above 200 Hz” allows to use progressively narrower (higher Q) filters for bass issues below 200 Hz but allows for broader (lower Q) filters at higher frequencies, preventing overly sharp, unnatural-sounding corrections above the bass region, aiming for a smoother, more musical result as it moves toward treble. It's often used with “Allow narrow filters below 200 Hz” for comprehensive correction.

Under Filter tasks hit “Match response to target”. Hit EQ filters button to get dialog for additional manual filter adjustment.

Check the deep dips for their wavelength with the simple formula: distance (in metres) = 85.75 / frequency (in Hz). You will usually find an early reflection point at that distance from the woofer to your ears. You cannot and should not equalize for these.

In the “Filter Tasks” section press “Save filter settings to file”. This will generate an XML file that can be imported in Rephase.