Finally, calibrate your headphones to your own ears.
To make headphones sound neutral, flatter, or more like loudspeakers, you have to calibrate them to your own ears — something that's always been hard to do accurately for yourself. The EarEqual Plug is the measurement tool that makes it straightforward. You measure your own headphones on your own ears, then build the correction yourself.
A measurement earplug for calibrating headphones to your own ears.
Hand-built headphone calibrator with an embedded measurement microphone. Doubles as a binaural recording rig. Ships sealed; supplied with TRS cable — contact us if you need a larger-canal fit.
Price is €130 + €10 shipping worldwide. For EU orders, VAT is included in the price. For US orders, customs and import duty are included in the shipping. Other countries may incur local import charges. An invoice is issued for every order.
Before ordering, see the setup & safety guide and the cleaning & hygiene notes.
EarEqual Plug
Measures your own ear with your own headphones on, so you can build a correction that's genuinely yours instead of a population average.
Works with the measurement and EQ software you already use, like REW and AutoEQ — bring your own workflow. A companion app that guides the whole process is coming.
Microphone
- Type
- Electret condenser, omnidirectional
- Diameter
- 6.0 mm
- Sensitivity
- −42 dB typ (ref 1 V/Pa, 1 kHz)
- Frequency range
- 100 Hz – 10 kHz
- SNR
- 60 dBA
- RoHS
- Yes
Plug body
- Material
- Platinum-cure silicone, Shore A20
- Dimensions
- 8.0 / 8.7 × 12 mm
- Cable
- TRS, 3.5 mm plug
EarEqual Tip
Replaces the tip on your earbuds and measures the acoustics of your own ear canal — the foundation of sound that's truly personalized.
The hardware is built and working. Full measurement software is in development.
Your headphones sound different on your ears than on anyone else's.
A headphone's sound is shaped by the ear it plays into — your ear's shape, and how the headphone seals and sits on it. That's why the same headphones don't sound the same to everyone. To correct yours toward any target you choose, you first have to measure what they actually do on you. The Plug is simply a microphone placed to read that, in the ear that's wearing the headphones.
Measure
With the Plug in your ear and your headphones on, capture their real frequency response in REW or similar.
Define a target
Choose what you want them to sound like: flat, an average diffuse-field curve, or your own individual target.
More about targets coming soon.
Make the filter
The correction is your target divided by your measured headphone response — the EQ that closes the gap.
Apply it
Load the filter into AutoEQ, a convolver, or the EQ software you already use, and listen.
Measured on you
The Plug reads the frequency response your headphones actually produce at your own ear, not a coupler's and not an average listener's. That measurement is the starting point for any correction you want to build.
Consistent placement
Where you measure inside the ear changes what you measure. The Plug is designed to sit repeatably — session to session, person to person — in a way clip-on mics and DIY builds can't reliably match.
Also a binaural rig
Not a hand-built one-off. Robust, consistent, and made for the same result every time — and because the left and right channels stay separate, the same hardware doubles as a binaural recording rig.
Cross-section showing the embedded microphone, cable, and hollow silicone shell. The ear-canal side is soft and thin-walled (Shore A20 silicone), which combined with the internal cavity makes it noticeably flexible — not the solid piece it may appear to be in photos.
Dimensions in mm: 12.0 length · 8.7 vertical / 8.0 horizontal.
A career spent inside the ear canal — now turned into hardware you can hold.
I'm Marko, an acoustics researcher. My work has always been about one question: what is the sound actually doing at your eardrum, and how do we measure it honestly? EarEqual is that research made physical — measurement tools precise enough for a lab, simple enough to use at your desk.
The tools are real, the manufacturing works, and the Plug is shipping worldwide now. If that's the kind of thing you've been waiting for, order above.