Headphone calibration with just reverb?!

Summary

The video presents a free way to make headphone mixing feel more like listening to flat speakers in a room: apply a headphone-specific correction toward the Harman Target Curve using a convolution reverb loaded with an impulse-response (IR) file.

Why calibrate headphones?

• Headphones can sound very different from speakers in a room. With speakers, the shape of your ears and body, room reflections, and the way sound reaches both ears all affect what you hear.
• Headphones bypass much of that listening experience. A frequency response that measures flat on headphones may therefore sound unnatural.
• The Harman Target Curve is one researched target intended to make headphone playback more speaker-like. In the video, its key features include:
  • A low-frequency lift, partly addressing headphones’ difficulty reproducing deep bass.
  • A boost around 3 kHz, associated with the ear-canal resonance listeners experience with sound in a room.
  • A gradual reduction in very high treble.
• Headphone models differ, so the correction needs to match the specific headphones and a suitable measurement.

Workflow: Apply a Harman correction with a convolution reverb

1. Find your headphone model in the AutoEq database.

   • Look for a measurement and correction for your exact model.
   • Some models have multiple measurements or target options; choose the one you intend to use.
   • The video’s example uses a minimum-phase, 48 kHz WAV impulse response for a HiFiMAN Ananda.

2. Download the correction IR.

   • Open the relevant headphone entry and download its WAV impulse-response file.
   • The video notes that the database also provides EQ filter recommendations, but using the IR is the simpler approach shown.

3. Load the IR into a convolution reverb.

   • In Ableton Live, add Hybrid Reverb and load the downloaded WAV file into its convolution section.
   • Set the device so it functions only as an IR-based correction:
     • Use convolution mode.
     • Turn off pre-delay and time-based processing.
     • Turn off any additional EQ.
     • Set the mix fully wet.
   • These settings matter: other processing can change the response and undermine the intended correction.

4. Put the device on the monitoring path.

   • Place the convolution reverb on the main or master monitoring track so you hear your mix through the correction.
   • The video demonstrates the effect with white noise and a frequency-response analyzer.

5. Bypass it before exporting.

   • The correction is for monitoring only. Disable or bypass it before rendering the final mix, or the headphone correction will be printed into the audio.

Alternatives and caveats

• The video mentions commercial headphone-calibration options, including Sonarworks SoundID, Realphones, and Slate VSX.
• If you do not have Ableton Suite or Hybrid Reverb, the presenter suggests the free MeldaProduction bundle’s MConvolutionEZ. It can load a custom IR, though its loudness normalization may make the output level differ from Hybrid Reverb; the intended target curve remains the same.
• Headphone calibration may make listening more comfortable for some people, but it does not necessarily eliminate fatigue.
• Headphones also lack the natural crossfeed and room ambience of speaker listening. Hard-panned sounds can feel disorienting or tiring. Cross-talk/crossfeed plugins are an optional way to address this; the presenter says they are developing a free solution.
• Neither the Harman curve nor crossfeed is essential. The presenter emphasizes learning your headphones’ and room’s tendencies, trying different approaches, and choosing a setup that feels natural and lets you work comfortably.

Speakers and sources featured

• Speaker: The video’s narrator and presenter, associated with the Seed To Stage channel; no personal name is stated in the subtitles.
• Research/source discussed: Harman’s research into headphone target curves.
• Measurement and correction resource: AutoEq GitHub database, drawing on headphone measurements. The video mentions Rtings, Super Review, and a measurement profile attributed in the subtitles to “oror 1990” (likely an auto-captioning error).
• Tools and products mentioned: Ableton Live Hybrid Reverb, MeldaProduction MConvolutionEZ, FabFilter Pro-Q, Sonarworks SoundID, Realphones, and Slate VSX.