64 Audio Fourté Universal Hybrid In-Ear Monitors
The 64 Audio Fourté is a groundbreaking flagship UIEM that redefined what’s possible in portable audio. As the first IEM to fully integrate the patented tia™ system—including open balanced armature drivers, acoustic chambers, and single-bore architecture—Fourté delivers unmatched resolution, imaging, and an expansive out-of-head soundstage. With a hybrid driver design that includes a dynamic low driver and three balanced armatures, Fourté achieves rich bass, lush mids, and stunningly airy highs. Featuring an anodized black aluminum shell, copper anodized faceplate, and a hand-patinated copper chip, each unit is a one-of-a-kind fusion of art and engineering.
Specifications
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Driver Configuration: 1 Dynamic Low, 1 tia Mid, 1 High-Mid, 1 tia High
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Frequency Response: 5 Hz – 22 kHz
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Sensitivity: 114 dB/mW @ 1 kHz
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Impedance: 10 Ω @ 1 kHz
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Crossover: Integrated 4-Way Passive Crossover
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Apex Isolation: -20 dB (Internally Integrated Apex System)
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Shell Material: Black Anodized Aluminum
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Faceplate: Copper Anodized Aluminum with Patina-Treated Copper Chip
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Cable: 3.5mm Black Premium Cable – Silver-Plated OCC Copper (7x7x4 Multi-Twist, 26 AWG, 0.23Ω)
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Included Accessories: Premium Leather Case, TrueFidelity Foam Tips (S/M/L), SpinFit Silicone Tips (S/M/L), Standard Silicone Tips (S/M/L), Cleaning Tool, Cable Clip, Round Sticker
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Technology: Full tia™ System, Internally Integrated apex™, Passive Radiator
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Fit: Universal
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Designed & Assembled: In the USA with globally sourced components
Expanded Key Features List
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Complete tia™ System: Features tia high, tia mid, and single-bore design for distortion-free, transparent sound.
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Dynamic Low Driver: Produces deep, authoritative bass with natural impact and speed.
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Internally Integrated apex™: Provides -20 dB of isolation while relieving ear pressure for improved comfort and soundstage.
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Hybrid Driver Tuning: Balances rich lows, smooth mids, and ethereal highs for a reference-grade listening experience.
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Out-of-Head Soundstage: Industry-leading spatial imaging creates a holographic and immersive presentation.
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Hand-Finished Design: Each unit features a unique copper patina faceplate chip for one-of-a-kind aesthetics.
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Black Premium Cable: Silver-plated OCC copper cable ensures signal purity with low resistance.
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Ergonomic Shell Shape: CNC-machined for precision fit and long-term comfort in a robust aluminum chassis.
Q&A Section
Q: What makes the Fourté unique in the 64 Audio lineup?
A: Fourté is the first IEM to feature the full tia™ system and internally integrated apex™, offering an expansive soundstage and reference-grade resolution with only four drivers.
Q: What type of sound signature does the Fourté provide?
A: It delivers a wide, airy presentation with extended highs, clean mids, and impactful lows—ideal for critical listening and audiophile enjoyment.
Q: What is the benefit of the full tia™ system?
A: The full tia™ system eliminates sound tubes, reducing distortion and enhancing treble clarity, spatial imaging, and transient response.
Q: Does the Fourté use a dynamic driver?
A: Yes, it includes one dynamic driver for lows, delivering natural bass with speed and physicality.
Q: How is apex™ integrated in the Fourté?
A: Apex™ is built directly into the shell, offering -20 dB of isolation while relieving ear pressure for fatigue-free listening sessions.
Q: Is every Fourté visually unique?
A: Yes, each Fourté features a real copper faceplate chip that develops its own patina, ensuring every unit is one of a kind.
Q: Can the cable be replaced or upgraded?
A: Yes, it uses a standard 0.78mm 2-pin connection, allowing for easy cable upgrades or replacements.
Q: What comes with the Fourté package?
A: The package includes the IEMs, premium case, three types of ear tips, black premium cable, cleaning tool, cable clip, and a round sticker.
