Fourté is not simply a four-driver hybrid in-ear monitor. It is built around multiple industry-first innovations that redefine high-end IEM performance.

Its solid aluminum shell construction and ergonomic fit established the modern 64 Audio universal IEM design language when it debuted in 2016, setting a benchmark that continues to influence the industry.

Acoustically shaped micro-chambers, direct-radiating drivers, and a single sound bore architecture come together within 64 Audio’s patented tia technology.

Fourté was also the first IEM to feature internally integrated patented apex technology, marking a significant advancement in pressure management and listening comfort.

The black anodized aluminum shell is paired with a copper-colored anodized aluminum faceplate and a beautifully aged copper chip. Each faceplate develops its own distinctive patina pattern over time, ensuring that no two Fourté units are exactly alike.

Beyond aesthetics, Fourté’s unique driver configuration, acoustic chambers, integrated apex technology, and passive radiator work in unison to deliver an unrivaled sonic experience.

Tubeless In-Ear Audio (tia)

The tia driver system delivers direct-radiating, highly efficient high-frequency reproduction, providing detailed treble and enhanced stereo imaging.

Air Pressure Exchange (apex)

The Apex modules regulate internal air pressure, improving low-frequency response while maintaining natural mids and treble for a balanced and immersive sound signature.

"It truly amazes me how easily the Fourté reproduces every single note of each track I fire through it. Nothing gets overshadowed, everything is just there and sounds perfectly clean with incredible separation."

– Linus (Headfonia)

"From the first listen, the sound is stunning. The Fourté delivers exceptional detail, separation, and attack, with a grand, dynamic presentation and powerful bass that instantly confirms its flagship status."

– Smit Patel (Enjoy the Music)

"To say these are airy doesn’t cover it by half. The emphasis on upper treble, combined with the sheer audacity of its extension, blows the roof wide open, letting in unimaginable air and height."

– Pinky Powers (The Headphone List)

WEIGHT

500 g/piece

CABLE

Silver Plated OCC Copper Wire

SENSITIVITY

114dB Sensitivity @1kHz @1mw