Measure your headphones. Record through your own ears.
The EarEqual Plug is one wearable device for two connected jobs: individualized headphone calibration and true binaural recording. Measure what your headphones actually do on your own ears, or capture stereo sound shaped by your own head and outer ears.
The measurement hardware.
A pair of hand-built measurement earplugs with two independent microphone channels and a 3.5 mm TRS connection.
Early-bird price + €10 shipping worldwide. For EU orders, VAT is included. For US orders, customs and import duty are included in the shipping. Other countries may incur local import charges.
Supplied as a left/right pair with 3.5 mm TRS cable.
Before ordering, see the setup & safety guide and cleaning & hygiene notes.
Order EarEqual PlugMicrophone
- Type
- Electret condenser, omnidirectional
- Diameter
- 6.0 mm
- Sensitivity
- −32 ±3 dBV/Pa (1 kHz)
- Frequency range
- 20 Hz to 20 kHz
- SNR
- 75 dBA
- RoHS
- Yes
Plug body
- Material
- Platinum-cure silicone, Shore A20
- Dimensions
- 8.0 / 8.7 × 12 mm
- Cable
- TRS, 3.5 mm plug
Use either function on its own. Use both and they connect.
The Plug places a microphone at each blocked ear-canal entrance. That same physical position can be used to measure your headphones or to record the sound arriving at your own ears.
Measure the headphones on you
Your headphone response depends on your anatomy, fit and seal. Measure that response on your own ears, then correct it using either your own measured acoustic target or the EarEqual Reference Target.
Record through your own outer ears
Record true left and right channels while your own head, pinnae and conchae shape the spatial cues. The BOYA BY-K4 gives the Plug a low-cost stereo USB-C input path for phones, tablets and computers.
Record and calibrate at the same acoustic reference point.
For your own binaural recordings, the recording and headphone measurement use the same blocked-ear reference point. The recording itself provides the playback reference, so you do not need a separate generic headphone target. When you remove the Plug and listen normally, your own ear canals are naturally back in the playback path.
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.
Built from acoustics, engineering and product development.
I'm Marko Hiipakka, an acoustics and audio engineer with a PhD in acoustics and signal processing. I've worked across research, product development, prototyping and audio engineering, with ear acoustics and individual sound reproduction recurring throughout that work.
EarEqual grew out of that background: taking measurement methods that normally belong in laboratories and turning them into practical tools people can use themselves.
The Plug is the first product, for individual headphone calibration and binaural recording. I'm also developing the EarEqual Tip, which brings the measurement microphone into an eartip for individual earbud measurement. The hardware is already working and the measurement software is in development.