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Audio equipment burn-in tones: what fixed tones can and can't do

By TechCompare · Updated · How we check

Mechanical burn-in is measurable but the audible effect is small, and most 'improvement' listeners report is confirmation bias. A tone generator can run break-in signals for hours without involving your ears.

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Frequency Generator

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40 Hz sine
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Audio equipment burn-in is the practice of playing signals through new headphones, speakers, or capacitors to 'loosen up' the drivers before critical listening. The honest position is that mechanical burn-in does happen to some extent, especially for moving-coil headphones with suspension parts, but the audible effect is small and the ritual around it is mostly confirmation bias. This tool can play a fixed tone for break-in without involving your ears.

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1
Single tone
Frequencies
40 Hz
Waveform
Sine
Per-oscillator lanes

How this is calculated

The mechanism is real: a brand-new driver's suspension is stiffer than it will be after a few hours of motion, and the surround and spider can soften slightly with use. Measurements have shown small shifts in low-frequency response after extended break-in, typically in the range of fractions of a decibel. Whether that's audible is another question. The science suggests usually no, but believers will hear whatever they expect to hear.

The practical use of a tone generator for burn-in is to play a low-frequency sine at moderate volume for several hours without you having to listen, breaking in the suspension without fatigue. Avoid playing pure sines loud enough to damage the driver, because that is a stress test and it can permanently change or break the suspension.

Verdict

To break in a new driver, play a low sine at moderate volume for a few hours and don't expect a transformation. Mechanical break-in is real but small, and loud pure tones are a stress test that can damage the suspension.

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Related guides

Speaker test tones
Fixed tones for checking selected speaker frequencies during burn-in.
View guide
Subwoofer test tones
Low-frequency tones that exercise the subwoofer during burn-in.
View guide

Frequently asked questions

Is audio equipment burn-in real?
Mechanical burn-in for moving-coil drivers is real and measurable: suspension parts soften slightly with use. But the audible effect is typically less than a decibel. Most listener-reported 'improvements' are confirmation bias caused by your ears adapting to a new sound signature over time.
What frequency is best for breaking in headphones?
A low sine tone around 30 to 50 Hz at moderate volume moves the suspension through its full range without risking tweeter damage. Run it for a few hours at a level you can comfortably talk over.
How long should I run burn-in tones?
If you want to do it at all, 20 to 50 hours of moderate-volume low-frequency signal captures whatever mechanical change is going to happen. Beyond that, additional break-in yields diminishing returns and risks the suspension if you push the volume.

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