64 Audio U4s Universal Hybrid In-Ear Monitors
The 64 Audio U4s is a breakthrough 4-driver hybrid UIEM that brings flagship technology to a more accessible price point without sacrificing sonic performance. Combining one dynamic driver with three balanced armatures—including a patented tia™ high driver—the U4s delivers impactful sub-bass, neutral mids, and an open, airy treble for an immersive, fatigue-free listening experience. Enhanced by LID™ for consistent sound across devices and apex™ venting modules for pressure relief and expanded soundstage, U4s offers both comfort and tuning flexibility. Housed in an anodized Slate Blue aluminum shell with a meteorite-inspired faceplate, U4s is as stunning as it is sonically refined.
Specifications
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Driver Configuration: 1 tia High Driver, 1 High-Mid Driver, 1 Mid Driver, 1 Dynamic Low Driver
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Frequency Response: 10 Hz – 20 kHz
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Sensitivity: 107 dB/mW @ 1 kHz
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Impedance: 11 Ω @ 1 kHz
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Crossover: Integrated 4-Way Passive Crossover with Electrical Low-Pass Filter
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Apex Isolation: -10 dB (mX), -15 dB (m15), -20 dB (m20)
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Shell Material: Anodized Aluminum with Meteorite-Inspired Faceplate
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Color: Slate Blue
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Cable: Black Premium Cable – Silver-Plated OCC Copper (7x7x4 Multi-Twist, 26 AWG, 0.23Ω), 3.5mm Termination
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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), Apex Modules (m20, m15, mX), Cable Clip, Cleaning Tool, Round Sticker
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Technology: tia™ Driver & Single-Bore, apex™ Venting System, LID™, Electrical Low-Pass Filter
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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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Hybrid Quad-Driver Design: Combines dynamic and balanced armature drivers for full-spectrum performance and low distortion.
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tia™ High Driver with Single-Bore: Delivers open, extended treble with reduced resonance and enhanced detail.
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apex™ Venting System: Includes three swappable modules (m20, m15, mX) for pressure relief and customizable isolation.
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LID™ Circuitry: Ensures tuning consistency across various devices regardless of output impedance.
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Electrical Low-Pass Filter: Reduces low-frequency distortion by filtering unwanted signals before reaching the driver.
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Balanced, Engaging Sound: Deep sub-bass, clear mids, and smooth highs ideal for all genres at any volume.
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Premium Slate Blue Shell: Anodized aluminum housing with a unique meteorite-inspired faceplate design.
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Black Premium Cable: Durable silver-plated copper cable with low resistance for optimal signal transmission.
Q&A Section
Q: What type of sound can I expect from the U4s?
A: U4s offers rich sub-bass, smooth mids, and airy treble with a spacious soundstage—perfectly suited for both casual listening and critical enjoyment.
Q: How many drivers are in the U4s?
A: U4s features four drivers: one dynamic low, one mid, one high-mid, and one tia™ high driver for a full, coherent sound.
Q: What is the benefit of the tia™ technology in the U4s?
A: The tia™ high driver and single-bore design eliminate traditional tubing to reduce resonance and distortion, improving treble clarity and realism.
Q: Can I customize the sound of the U4s?
A: Yes, it comes with three apex™ modules (mX, m15, m20) that alter isolation and subtly shift the tuning to match your preferences.
Q: What makes the faceplate design unique?
A: The faceplate is inspired by Muonionalusta meteorite fragments and features a reflective finish that changes with light, making each unit visually distinctive.
Q: Does the U4s sound the same with different devices?
A: Thanks to LID™ technology, U4s maintains its intended sound signature across a wide range of sources, including DACs, amps, and smartphones.
Q: Is the cable included and upgradeable?
A: Yes, U4s includes a 3.5mm black premium cable and uses a standard 0.78mm 2-pin connection for easy upgrades.
Q: What accessories are provided with the U4s?
A: You receive a premium leather case, full tip kit (foam, silicone, SpinFit), apex modules, cable clip, cleaning tool, and sticker.
