Fourté

Universal

Fitting

4

Drivers

$3,599.00

    USDAmerican Flag

Fourté


Universal

Fitting

4

Drivers

$3,599.00

USD

Fourté is the pinnacle of in-ear monitor technology. With its entire design being made up of industry firsts, Fourté isn’t just a four driver hybrid UIEM. The innovations of acoustically shaping micro-chambers, direct radiating drivers, and the single sound bore come together in our patented tia technology. Fourté is our first IEM to feature internally integrated patented apex technology. These along with its ergonomic shell, machined out of solid aluminum, have dictated our entire UIEM design language since its development in 2016.

Sound

 

"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 initial listening, the sound is incredibly impressive. The Fourté is able to resolve and emit an orchestra of sound like no other. The separation, detail, attack along with the larger than life sound and undercurrents of the dynamic driver bass, consolidate its TOTL status immediately."

– 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)

The black anodized aluminum shell is topped off with a copper color anodized aluminum faceplate and a beautifully aged copper faceplate chip; each one developing a truly unique patina pattern making sure that no two Fourté are alike. Fourté’s unique drivers, acoustic chambers, integrated apex technology and passive radiator all unite delivering an unrivaled sonic experience. The level of detail retrieval coupled with its “out-of-head” sound-stage and deep reaching bass reanimate well-recorded music; putting its resolving capabilities at the level of some of the worlds greatest audiophile systems.

Featured Technology

Tubeless In-Ear Audio (tia) is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system is comprised of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. Fourté utilizes the complete Tia system; its four drivers radiate freely into the Tia bore with no obstructions to the drivers.

Air Pressure Exchange (Apex) is a patented vent that releases air pressure in a sealed ear canal all while retaining standard IEM levels of isolation; enabling music enthusiasts to listen more comfortably for longer. This venting alleviates listener fatigue and allows for a much more realistic soundstage. Apex is integrated in Fourté all the way down to the way the shell is milled, offering similar pressure release and isolation to our m20 module.

Tubeless In-Ear Audio (tia) is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system is comprised of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. Fourté utilizes the complete Tia system; its four drivers radiate freely into the Tia bore with no obstructions to the drivers.


Air Pressure Exchange (Apex) is a patented vent that releases air pressure in a sealed ear canal all while retaining standard IEM levels of isolation; enabling music enthusiasts to listen more comfortably for longer. This venting alleviates listener fatigue and allows for a much more realistic soundstage. Apex is integrated in Fourté all the way down to the way the shell is milled, offering similar pressure release and isolation to our m20 module.

All of our custom and universal IEMs are Designed, Assembled, and QC’d by highly skilled technicians in the United States using components sourced both domestically and globally from trusted suppliers.

Specifications

1 tia High Driver – 1 High-Mid Driver – 1 tia Mid Driver – 1 Dynamic Low Driver

5hz – 22kHz Frequency Response

114dB Sensitivity @1kHz @1mw

Integrated 4-way Passive Crossover

10Ω Impedance @1kHz

-20dB Internal Apex Technology

Specifications

1 tia High Driver – 1 High-Mid Driver – 1 tia Mid Driver – 1 Dynamic Low Driver

5hz – 22kHz Frequency Response

114dB Sensitivity @1kHz @1mw

Integrated 4-way Passive Crossover

10Ω Impedance @1kHz

-20dB Internal Apex Technology

All of our custom and universal IEMs are Designed, Assembled, and QC’d by highly skilled technicians in the United States using components sourced both domestically and globally from trusted suppliers.

Black Premium Cable

0.23 Ohms Total Impedance

7 x 7 x 4 Multi-Twist

Silver Plated OCC Copper Wire

26 AWG

Terminated in 3.5mm

Included

Fourté Universal In-Ear Monitors

64 Audio Premium Leather Case

TrueFidelity Foam Ear Tips (S,M,L)

SpinFit Silicone Ear Tips (S,M,L)

Silicone Ear Tips (S,M,L)

3.5mm Black Premium Cable

Cleaning Tool

Cable Clip

Round Sticker

Fourté


Universal

Fitting

4

Drivers

$3,599.00

USD

Sound

"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 initial listening, the sound is incredibly impressive. The Fourté is able to resolve and emit an orchestra of sound like no other. The separation, detail, attack along with the larger than life sound and undercurrents of the dynamic driver bass, consolidate its TOTL status immediately."

– 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)

 

Specifications

1 tia High Driver – 1 Dynamic Low Driver

20hz – 20kHz Frequency Response

98 dB/mW Sensitivity

Integrated 2-way passive crossover

9Ω Impedance

-12dB isolation apex core technology

Featured Technology

Rather than constricting the sound of the drivers by fitting a tube onto them, Duo’s complete Tia System reduces unwanted resonance and distortion by allowing the 9mm Dynamic Driver + Tia High Driver to radiate freely into the single large Tia bore with no obstructions to the front of the drivers.

Apex Core is a deeper understanding of air movement within an earphone system. Duo’s faceplate features a striking perforated grill that leaves the shell of the IEM open to the outside atmosphere for a less obstructed airflow resulting in an effortless reproduction of music and minimal physical fatigue.

Due to the high crossover point between the two drivers, Wave Sync was developed to ensure coherence; another industry first. By using a type of “all-pass” filter, we’re able to introduce a crossover while correcting for time without having to change the physical distance between the drivers.




Specifications

1 tia High Driver – 1 High-Mid Driver – 1 tia Mid Driver – 1 Dynamic Low Driver

• 5hz – 22kHz Frequency Response

114dB Sensitivity @1kHz @mW

Integrated 4-way Passive Crossover

10Ω Impedance @1kHz

-20dB Internal Apex Technology

All of our custom and universal IEMs are Designed, Assembled, and QC’d by highly skilled technicians in the United States using components sourced both domestically and globally from trusted suppliers.

Specifications

1 tia High Driver – 1 Dynamic Low Driver

20hz – 20kHz Frequency Response

98 dB/mW Sensitivity

Integrated 2-way passive crossover

9Ω Impedance

-12dB isolation apex core technology

Included

• Fourté Universal In-Ear Monitors

• 64 Audio Premium Leather Case

• TrueFidelity Foam Eartips (S,M,L)

• SpinFit Silicone Eartips (S,M,L)

• Silicone Eartips (S,M,L)

• 3.5mm Black Premium Cable

• Cable Clip

• Cleaning Tool

• Round Sticker

 



Fourté

Universal Fit - 4 Drivers

$3,599.00

    USDAll of our custom and universal IEMs are Designed, Assembled, and QC’d by highly skilled technicians in the United States using components sourced both domestically and globally from trusted suppliers.

Fourté

Universal Fit - 4 Drivers

$3,599.00

USD