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Engineering

No compromises,
anywhere.

40HRS

All-Day Battery

Play from sunrise to past midnight on one charge. Precision-engineered power management ensures maximum efficiency with ANC active at 70% volume.

−35dB

Adaptive ANC Pro

Four microphones continuously measure and cancel ambient noise in real time, creating an acoustic sanctuary.

40KHz

Hi-Res Certified

Titanium-coated drivers reach 40,000 Hz — twice the range of standard headphones for surgical precision.

5MIN

Quick Charge

Five minutes of charging gives three hours of playback. Never lose your rhythm when the moment strikes.

The Science of Sound

Every frequency,
faithfully reproduced.

The 40mm titanium-coated driver covers 4 Hz to 40,000 Hz — ten times what the human ear can detect. We engineered past the audible range so everything within it is as clean and accurate as the original recording.

Live Analysis: Arc Pro
Acoustic Response Curve

4Hz — 40kHz Laboratory Profile

20Hz200Hz2kHz20kHz40kHz
Sub-Bass
Bass
Mids
Presence
Air

LDAC Streaming

Lossless 990 kbps transmission for studio-grade wireless fidelity.

Spatial Audio

Head-tracked 360° soundfield with dynamic movement.

Custom EQ

5-band parametric EQ in the Caliper iOS and Android app.

Our Story

Precision is not a feature.
It's a philosophy.

We started Caliper because we were frustrated. Every premium headphone made you choose — between sound quality and comfort, between style and stamina, between softness and precision. We refused to accept that trade-off.

We spent three years getting it right. 47 prototypes. Thousands of listening sessions. One obsessive question: what does precision actually feel like? The Arc Pro is our answer — exactness, confidence, and zero tolerance for approximation.

98%customer satisfaction
3

Years in development

Est. 2021

47

Prototype iterations

Until perfect

2M+

Hours of testing

And counting

Specifications

Every number
tells a story.

Acoustic Architecture
Frequency Response4 – 40,000 Hz
Harmonic Distortion< 0.05% THD
Driver Unit40mm Titanium
Impedance32 Ω
Sensitivity103 dB SPL/mW
Connectivity
Wireless ProtocolBluetooth 5.4
Hi-Res CodecsLDAC · aptX HD · AAC
Latency40 ms
Multipoint3-device simultaneous
NFCOne-tap pairing
Endurance
Total Playback40 hours
Rapid Recovery5 min → 3 hours
Standby Time400 hours
ChargingUSB-C PD 3.0
Full Charge< 2 hours
Physical
Mass248 g
Ingress ProtectionIPX4
MaterialsAerospace aluminum
Ear CushionsProtein leather
FoldableFlat & vertical
Finishes
Download detailed architecture & engineering specs →
Verified Reviews

Heard from real ears.

4.9 stars across 2,847 verified reviews from audiophiles, producers, and everyday listeners.

“The first pair I haven't had to EQ. The titanium drivers just get out of the way and let the music through. The ANC is genuinely magical — I use them in the studio for focus sessions. Best headphones I've owned in 15 years.”

Sarah KimS

Sarah Kim

Music Producer, Los Angeles

“Battery still hits 38+ hours after six months. Bluetooth multipoint is flawless — switches between my laptop, phone, and iPad constantly and just follows me. Build quality feels like it'll outlast three phone generations.”

Marcus TeoM

Marcus Teo

Software Engineer, Singapore

“Comfortable for 8-hour sessions. I'm picky about how things look and feel. These are stunning. Protein leather breaks in perfectly and the clamping force is just right. Caliper clearly spent time on the ergonomics.”

Priya MehtaP

Priya Mehta

UX Designer, London

Loved by listeners on every platform

Spotify
Apple Music
Tidal
TIDAL
Amazon Music

Experience sound
differently.

Caliper Arc Pro — starting at $349

Caliper Arc Pro — Midnight Black

Arc Pro

Wireless Over-Ear Headphones

$349

Color — Midnight Black

Free worldwide shipping
30-day free returns
2-year warranty