64 Audio U18s Universal Reference In-Ear Monitors

The 64 Audio U18s builds upon the legendary U18t platform, offering an evolution in both design and sound with 18 precision-tuned balanced armature drivers and cutting-edge crossover technology. With a handcrafted fractal shell made from aerospace-grade aluminum, U18s delivers a striking aesthetic alongside world-class sonic performance. Its advanced driver layout—featuring tia™ technology, apex™ pressure relief, and LID™ circuitry—results in exceptional clarity, immersive realism, and fatigue-free listening. Whether for professional mastering or immersive audiophile enjoyment, the U18s provides an expansive soundstage and unparalleled musical detail.

Specifications

• Driver Configuration: 1 tia High, 1 High-Mid, 8 Mid, 8 Low (Balanced Armature)
• Frequency Response: 10 Hz – 20 kHz
• Sensitivity: 106 dB/mW @ 1 kHz (84mV)
• Impedance: 8 Ω Nominal
• Crossover: Integrated 4-Way Passive Crossover with Electronic Low-Pass Filter
• Apex Isolation: -10 dB (mX), -15 dB (m15), -20 dB (m20)
• Shell Material: CNC-Milled Aerospace-Grade Aluminum with Fractal Design
• Color: Matte Black with Textured Finish
• Cable: 3.5mm 8-Braid Silver Cable – Silver-Plated OFC, 8 Conductors, 65 strands of 44 AWG, 0.28Ω
• 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), Round Sticker
• Technology: tia™ Driver & Single-Bore, apex™ Venting, LID™, Electronic Low-Pass Filter
• Fit: Universal
• Designed & Assembled: In the USA using globally sourced components

Expanded Key Features List

• 18 Balanced Armature Drivers: Engineered for reference-level performance with exceptional separation and control.
• tia™ High Driver & Single-Bore: Offers lifelike high frequencies with zero tubing resonance and pristine detail.
• apex™ Modules Included: Customizable pneumatic pressure relief with mX, m15, and m20 for comfort and soundstage optimization.
• Electronic Low-Pass Filter: Reduces unwanted distortion by eliminating problematic frequencies before they reach the driver.
• LID™ Circuitry: Maintains a consistent frequency response across all audio sources regardless of impedance.
• Fractal Shell Design: Aerospace-grade aluminum shell finished with precision milling and dual anodizing for both strength and visual appeal.
• 8-Braid Silver Cable: Low-resistance, silver-plated oxygen-free copper construction with high strand count for ultra-clean signal transfer.
• Expansive Soundstage: Wide and immersive imaging brings music to life with remarkable transparency and presence.

Q&A Section

Q: How does the U18s differ from the U18t?
A: U18s uses a redesigned crossover network, upgraded internal components, and a more neutral tuning while maintaining the signature detail and clarity of the U18 series.

Q: What kind of sound signature does the U18s offer?
A: U18s delivers a reference-grade tuning with excellent transparency, natural warmth, extended lows, and fatigue-free highs—ideal for critical listening or audiophile enjoyment.

Q: What’s the benefit of the tia™ driver in the U18s?
A: The tia™ driver provides open, direct sound delivery without the resonance or congestion found in traditional tubed BA setups, greatly enhancing treble realism and separation.

Q: Are apex™ modules included?
A: Yes, U18s includes three apex™ modules (mX, m15, m20) that allow you to fine-tune the isolation and pressure relief based on preference and use case.

Q: Can I use U18s with different sources?
A: Yes, the built-in LID™ circuit ensures consistent performance across all devices, from portable players to studio-grade amps and DACs.

Q: Is the U18s comfortable for long listening sessions?
A: Absolutely. The ergonomic aluminum shell, pressure-relieving apex™ system, and light weight design make U18s ideal for hours of listening.

Q: What makes the shell design special?
A: Each U18s shell is CNC-machined from aerospace-grade aluminum and features a nature-inspired fractal pattern for durability and elegance.

Q: What comes in the box with the U18s?
A: The box includes the IEMs, 8-braid silver cable, premium leather case, multiple sets of ear tips, three apex™ modules, cleaning tools, and a collector sticker.