Headphone Burn-In — Pink Noise

Headphone burn-in runs a controlled conditioning loop through new headphones: 20 seconds of pink noise followed by a 10-second 20 Hz to 20 kHz logarithmic sweep, on a 15, 30 or 60-minute timer with an active volume guard. The signal is generated in your browser; nothing is uploaded.

How to use it

1. Take the headphones off and set them down. Rest them flat on a desk, mousepad or folded towel in a room where you are not working. Never run burn-in on your head or in your ears.
2. Choose a mode. Dual Cycle (the default) alternates pink noise and the sweep; Pink Noise Only holds the broadband signal; Sweep Only runs the glide on its own.
3. Set the duration. Presets cover 15, 30 and 60 minutes, and the custom field accepts 1 to 1440 minutes. Fifteen minutes is the default.
4. Check the volume guard. It starts locked at 35% maximum, and the slider defaults to 20% (−14.0 dBFS). Lifting the guard raises the ceiling to 50% (−6.0 dBFS) and asks for confirmation first.
5. Press Start burn-in. The countdown, cycle badge and phase badge show what is playing; the live Hz readout and sweep ribbon track the glide. Stop & Reset ends the session.

The dual-cycle signal

The dual cycle exists because pink noise and a sweep stress a driver differently. Pink noise drops 3 dB per octave, giving every octave band the same energy, so it exercises the whole diaphragm without dumping power into the top octaves the way white noise would. The logarithmic sweep visits one frequency at a time: a 10-second glide across three decades covers each octave in about 1 second (one cycle of 20 Hz lasts 50 ms), so the 20–40 Hz octave gets roughly 29 cycles while 10–20 kHz gets more than 14,000. That slow low-frequency pass is where a driver sees its largest excursion.

Mode	Signal	Cycle length	What it exercises	When to use it
Dual Cycle	20 s pink noise + 10 s log sweep	30 s	Broadband modes plus low-frequency excursion	Default
Pink Noise Only	−3 dB/octave broadband noise	Continuous	All octaves at once, no hotspots	Gentle conditioning
Sweep Only	20 Hz to 20 kHz logarithmic glide	10 s	Cone travel at the bottom, surround behaviour at the top	Rattle diagnosis and excursion checks

What burn-in can and cannot change

Dynamic drivers do have a mechanical suspension: a voice coil glued to a diaphragm, held by a surround and a spider. Polymer surrounds relax slightly during their first hours of movement, and bench measurements report the free-air resonance drifting down by a fraction of a hertz to a few hertz. That shift is small, and well below the “night and day” change forum posts describe.

Most of what people hear with new headphones is perceptual. If your previous pair had boosted bass and dull treble, a neutral pair sounds thin and bright at first; after a few hours your brain recalibrates and the same headphones sound balanced. Run a short, safe routine if you want to, but do not expect a transformation, and do not use “it will open up after 200 hours” to justify keeping a headphone you dislike.

Balanced armature drivers have no rubber surround to loosen, and planar magnetic diaphragms are tensioned at the factory, so mechanical break-in arguments apply least to those designs. Earpad compression changes the seal and bass response far more than suspension settling.

Volume, heat and safety

A headphone driver is a small voice coil with very little thermal mass, so sustained high power has nowhere to go. Heat builds inside the sealed cup, and long unattended soak sessions at high level are the situation that risks adhesive and diaphragm damage.

• Keep the guard locked unless you have a specific reason: the default 20% setting is −14.0 dBFS, the locked ceiling of 35% is about −9.1 dBFS, and the zones run safe up to 0.35, caution to 0.45, then danger.
• Never let the level exceed what would be comfortable to listen to; if you would not wear the headphones at that volume, do not run burn-in there.
• Short blocks are the safe pattern: 15 to 30 minutes, then a break. Three 30-minute blocks a day for a week is about 10 hours of oscillation.
• Keep the headphones away from your ears for the whole session; broadband noise is still a high sustained dose when it is sealed against an eardrum.

Accuracy, limits and troubleshooting

• This is a signal generator, not a measurement: it cannot read the driver’s resonance, distortion or frequency response. Use the Headphone Test and Earbud Test to compare before and after.
• Gain is not sound pressure. 20% on the slider is a fixed digital level, but SPL depends on headphone sensitivity and impedance: a 32 Ω portable pair and a 300 Ω studio pair will be very different loudnesses at the same position.
• Background tabs keep playing in most desktop browsers, but closing the tab ends the session.
• Wired is the honest test path. Bluetooth compression and buffering can alter the signal and add dropouts; run the conditioning over a cable if the headphones have one.

Related tools

• Headphone Test — check driver balance, bass extension and treble limits before and after.
• Earbud Test — verify tip seal and channel matching for in-ear models.
• Noise Generator — white, pink and brown noise with filters for other conditioning and masking jobs.
• Audio Equipment Test: the hub that sequences speaker, headphone, subwoofer and latency checks.

Aliases and related procedures: headphone burn in, headphone break in generator, pink noise burn in tool, IEM burn in sweep, 20Hz-20kHz driver break in.